Choosing Between Stick Packs and Sachets: A Guide for CPG Brands on Optimal Single-Serve Packaging

The single-serve flexible packaging market was valued at $35 billion in 2024, and industry analysts project it will reach $55 billion by 2033. The supplement and nutrition packaging segment alone is on a trajectory from $27 billion in 2024 to over $42 billion by 2034. These numbers reflect a structural shift in how consumers across health, hydration, and functional food categories want to buy and use products.

Within that expansion, two formats dominate the powdered and portioned segment: the stick pack and the sachet. They look similar. They are produced on similar machines. And they serve the same fundamental purpose. The differences between them, though, are technical and consequential. Packaging decisions can account for up to 30% of a product's total production cost.

Many CPG brands, particularly at the launch stage, make format choices based on aesthetic preference or competitive benchmarking rather than on fill weight data and production economics. The result is often a mismatch that reveals itself only once manufacturing begins. This guide is intended to prevent that.

Why the stakes are higher than most brands realize

$35B

Single-serve flexible packaging market value, 2024 (source: Strategic Packaging Insights)

6.4%

CAGR for single-serve packaging through 2030 (Grand View Research)

15–25%

Film material reduction: stick packs vs. equivalent-volume sachets

1,000+

Stick packs per minute achievable on advanced multi-lane VFFS systems

The anatomy of each format

STICK PACKS

A stick pack is a tubular, single-serve pouch formed from a continuous roll of laminated film on a vertical form-fill-seal (VFFS) machine. The machine draws the film over a mandrel, forms a tube with a vertical side seam, seals the bottom, doses product into the tube from above, then seals and cuts the top. The result is a narrow, elongated package typically measuring 15 to 40 mm in width and 80 to 200 mm in length.

The tube geometry is optimized for free-flowing, fine-particulate products that fall cleanly through a narrow nozzle under gravity: collagen peptides, electrolyte powders, matcha, instant coffee, and fine-grind pre-workout blends. One constraint is absolute: there is no such thing as a pre-formed stick pack. Any brand planning a stick pack SKU requires either a contract manufacturer equipped with stick pack lines or its own VFFS equipment.

SACHETS

A sachet is a flat, typically rectangular pouch sealed on three or four sides. Dimensions generally span 40 to 80 mm in width and 50 to 100 mm in length, though the format scales for larger fills. The flat geometry creates a wider fill nozzle that handles diverse product consistencies and a larger printable surface for branding.

Sachets accommodate free-flowing powders, coarse granules, viscous gels, liquids, pastes, and creams. A three-side-seal pre-formed sachet can be filled and heat-sealed manually with basic equipment, which makes the format accessible for early-stage brands before they have committed to a co-packing relationship or production volume.

FORMAT CONTEXT

The tubular geometry of a stick pack is not a design choice. It is a direct consequence of how VFFS machines form film around a narrow mandrel. Choosing a stick pack is implicitly choosing a production process and a fill constraint, not just a shape. Brands should understand this before committing.

Fill weight: the primary filter

Fill weight is the most reliable first-pass filter when choosing between formats. The mechanics of a tube require the product to fall freely through a narrow fill nozzle into a confined cylindrical space. As fill weight rises, the tube must either grow longer or its diameter must increase. Both outcomes produce packages that are harder to handle, harder to seal consistently, and that lose the ergonomic and logistical advantages the format was designed to deliver.

In practice, stick packs operate most reliably in the 1 to 15 gram range for powder fills. Sachets can handle fills from under 5 grams to well above 50 grams. VFFS machine data from manufacturers, including Samfull and Unified Flex, confirms the practical limits: a 5-gram powder stick on a 10-lane system runs at approximately 350 packs per minute; a 26-gram powder stick on a 4-lane system drops to around 128 packs per minute as the format strains against its geometry.

Product flow characteristics are equally important. Hygroscopic powders that clump during filling, coarse botanical ingredients with irregular particle sizes, and anything with viscosity above a thin gel will create nozzle bridging, fill weight variation, and seal contamination in a stick pack. Sachets tolerate all of these product variables far more gracefully.

 TYPICAL DIMENSIONS

15–40 mm wide × 80–200 mm long

40–80 mm wide × 50–100 mm long

IDEAL FILL WEIGHT

1–15 g (powder / fine granule)

5 g to 50+ g (powder, liquid, paste, cream)

PRODUCT COMPATIBILITY

Free-flowing fine powder, uniform granule, gel

Powder, liquid, paste, coarse granule, cream

SEALING

3-sided: vertical side seam + 2 horizontal end seals

3 or 4-sided horizontal and vertical seals

FILM USE PER UNIT

15–25% less film vs. equal-volume sachet

Higher film use, especially on the four-sided format

PRODUCTION THROUGHPUT

Up to 1,000 packs/min (multi-lane VFFS)

Typically lower; viscous fills require slower cycles

EQUIPMENT NEEDED

Specialized stick pack VFFS, always required

VFFS machine, or manual fill with pre-formed sachets

BRANDING SURFACE

Limited; narrow face only

Full flat face; edge-to-edge print viable

CONSUMER INTERACTION

Tear top, pour directly into liquid, one-handed

Tear corner, squeeze or pour, often two-handed

LOW-VOLUME VIABILITY

Requires a co-packer or owned VFFS equipment

Pre-formed sachets can be filled manually

TYPICAL CATEGORIES

Electrolytes, collagen, instant coffee, pre-workout, matcha

Protein powder, condiments, baby food, skincare, samples

FILL WEIGHT THRESHOLD

Once a powder fill exceeds approximately 15 to 18 grams, defaulting to a sachet is the technically sound choice. Attempting to run a 22-gram fill through stick pack equipment almost always produces an unusably long pack, inconsistent seal quality, or an elevated reject rate, all of which raise per-unit cost.

Cost and production realities

A format comparison that stops at film cost per metre is incomplete. The economics of single-serve packaging span material procurement, equipment access, co-packer run rate fees, secondary packaging, freight, and warehouse utilization. Each responds differently to the choice of format, and the cumulative difference at scale is substantial.

MATERIAL COST

Stick packs use 15 to 25% less laminated film per unit than a sachet of equivalent volume. The tube geometry eliminates one sealing flange and requires a narrower initial film width. For a brand running 5 million units annually, a 20% film reduction is a line item on the bill of materials that meaningfully affects gross margin per serving.

EQUIPMENT AND MINIMUM ORDERS

Sachets have a material operational advantage at low volumes. A brand can source pre-formed three-side-seal sachets, fill them with a semi-automatic heat sealer, and go to market without a co-packing minimum. This path is viable for sampling campaigns, DTC pilots, and proof-of-concept inventory. Stick packs offer no equivalent: the form-fill-seal process is inseparable from the equipment.

At the production scale, stick pack equipment runs faster. A multi-lane VFFS stick pack machine at 10 lanes produces 350 packs per minute with a 5-gram powder fill. Advanced Aranow systems reach 1,800 single-serve units per minute by combining multiple machine heads. For a co-packer, pricing runs by the hour; faster throughput translates directly into a lower cost-per-unit at the same output volume.

FREIGHT AND LOGISTICS

A rigid supplement bottle might weigh 10 to 15 grams empty; a stick pack for the same serving weighs 2 to 3 grams. Multiply that delta across a pallet, and the shipping economics shift materially. Stick packs also stack more efficiently in secondary cartons, reducing pallet count per unit shipped. For brands with national distribution or high-volume subscription fulfillment, packaging format is one of the most underutilized variables available for managing logistics cost.

VOLUME HEURISTIC

Under 500,000 units per year: sachets are typically more cost-accessible and operationally flexible. Between 500,000 and 2 million units: format economics begin to converge, and the choice depends on product type. Above 2 million units: stick pack material savings and throughput advantages compound significantly, provided the product is compatible.

Format by product category

ELECTROLYTES AND HYDRATION MIXES

This category is almost universally suited to stick packs. The fills are typically 5 to 10 grams of fine, free-flowing powder. The consumer behavior is pour-into-bottle, which the narrow stick pack opening accommodates cleanly. Brands in this space that default to sachets on aesthetic grounds are accepting a higher material cost and a lower throughput rate for no functional benefit.

COLLAGEN PEPTIDES AND FUNCTIONAL PROTEINS

Single-serve collagen products at 5 to 10 grams are natural stick pack candidates. The peptide powders are fine and free-flowing, and the pour-into-coffee or pour-into-water use case aligns with the tube geometry. Protein powder blends with serving sizes of 20 grams and above belong in sachets, regardless of how the competitive set is packaged.

PRE-WORKOUT AND SPORTS NUTRITION BLENDS

Sports nutrition is increasingly served by single-serve stick packs for flavored pre-workouts in the 8 to 14 gram range. Coarser blends with amino acid crystals, chunky botanical extracts, or high-moisture ingredients shift the format decision toward sachets. Particle size and moisture sensitivity, not category convention, should make this call.

SKINCARE AND PERSONAL CARE SAMPLES

Sachets dominate entirely. Liquids, serums, gels, and creams require the flat squeeze-to-empty geometry of a sachet. The full-face print area allows ingredient callouts, usage instructions, and brand storytelling in a way that a narrow stick pack face cannot.

CONDIMENTS, BABY FOOD, AND SEMI-VISCOUS FILLS

Any product with meaningful viscosity belongs in a sachet. Ketchup, soy sauce, honey, apple puree, and similar products require a piston or pump filler that meters into a flat pouch. Four-sided-seal sachets provide the corner-cut, squeeze-to-empty interaction these products require.

FORMAT SELECTION GUIDE

USE A STICK PACK WHEN

→  Fill weight is 1–15 grams

→  Product is a free-flowing fine powder

→  Consumer pours directly into a beverage

→  Annual volume exceeds 1 million units

→  Logistics cost and freight density matter

→  Categories: electrolytes, collagen, instant coffee, pre-workout, matcha

USE A SACHET WHEN

→  Fill weight exceeds 15 grams

→  Product is a liquid, paste, cream, or coarse granule

→  Hygroscopic or variable-flow powders are involved

→  Low-volume pilot or sampling run required first

→  Full-face branding surface is a strategic priority

→  Categories: protein powder, condiments, baby food, skincare, samples

Six mistakes CPG brands make when choosing packaging

01  Choosing a stick pack because it photographs well

Stick packs look premium and modern. They appear on the shelves of every major electrolyte and functional beverage brand, which creates a powerful anchoring effect for founders evaluating formats. Visual appeal is not a valid selection criterion when the fill weight is 22 grams, and the product contains coarse botanical particles. Aesthetics and production compatibility are separate questions, and they need to be answered in sequence.

02  Finalizing the format before confirming equipment access

Stick packs require VFFS equipment; there is no manual fill option. A brand that commits to stick pack artwork and DTC pre-launch marketing, then discovers its preferred co-packer only runs sachet lines, has a material supply chain problem. Equipment compatibility must be confirmed before the format is finalized.

03  Ignoring particle size and flow behavior

Fine, dry powder is not the same as a coarse botanical blend. Any product that clumps under humidity, contains irregular particles above a few millimetres, or has density variation across a batch will cause fill-weight inconsistency and nozzle bridging in stick pack equipment. The technical review of flow characteristics should precede equipment selection.

04  Staying with sachets at scale when stick packs would be cheaper

Established brands running millions of units of a fine, low-weight powder in sachets often maintain the format out of inertia. At volumes above 2 million units per year, the film savings, throughput gains, and logistics improvements of a switch to stick packs can be significant. The analysis is worth revisiting periodically.

05  Comparing formats on film cost alone

Film cost per linear metre is one variable in a multi-variable cost model. Freight weight, dimensional weight for parcel shipping, secondary carton sizing, co-packer run rates, and warehouse density all respond to format choice. The analysis needs to include the full cost system.

06 Deciding without a co-packer in the conversation

Format decisions made entirely within a brand's internal team, without early input from a manufacturing partner, routinely require expensive revisions. Co-packers have specific equipment configurations, minimum volume requirements, and fill capability limitations that are not visible from the outside. This conversation should happen during format evaluation, not after the decision is complete.

Scalability and manufacturing efficiency

The format chosen at launch tends to persist. Requalifying a packaging format mid-growth requires new film specifications, revised label artwork, updated co-packing agreements, and potentially a different manufacturing partner. The switching cost is not trivial. Brands that choose a format with clear eyes at launch save themselves a difficult conversation later.

THROUGHPUT AND LINE ECONOMICS

VFFS machine specifications from manufacturers, including Unified Flex and Aranow, document the throughput range for both formats. A 9-lane stick pack system running at 50 cycles per minute produces 400 to 450 packs per minute. A 16-lane configuration reaches 800 packs per minute. Aranow's high-output combined line reaches 1,800 single-serve units per minute. Sachet machines can match these numbers in raw unit count, but cycle rates drop for viscous or liquid products requiring longer dosing times.

MULTI-SKU PRODUCTION FLEXIBILITY

Sachet equipment offers meaningful flexibility advantages for brands with diverse product lines. Changing fill weight, switching between product types, or moving from a powder to a paste fill generally requires fewer tooling changes on sachet equipment than on stick pack lines. A brand running multiple flavors with varying densities and fill weights should discuss this with their co-packer before assuming stick pack efficiency advantages apply uniformly.

SUSTAINABILITY SIGNALS

Both formats use laminated flexible films that challenge end-of-life recyclability. Within that shared constraint, stick packs start with a lower material footprint: 15 to 25% less film per unit versus an equivalent sachet. That reduced material input matters to retail buyers who track packaging sustainability metrics.

"The format you ship at 100,000 units is not necessarily the format that serves you at 3 million. The time to think about that gap is before launch, not during your third production run."

WESTERN NP CO-PACK — PACKAGING STRATEGY PRINCIPLE

08  A FOUR-QUESTION DECISION FRAMEWORK

A four-question decision framework

Most format decisions become clearer when addressed in sequence. Working through these four questions in order tends to surface the right answer without requiring a full cost-modelling exercise upfront.

1.       What is your fill weight?  Weigh your formulated single-serve dose precisely. If it falls consistently below 15 grams and the product is a free-flowing powder, stick packs are a viable format. Above 15 grams, the default assumption should be sachet.

2.      What is your product's consistency?  Liquids, pastes, creams, coarse granules, and hygroscopic blends are sachet products regardless of fill weight. Fine, dry, free-flowing powders can go either way within the appropriate weight range.

3.      What is your realistic volume in year one and year two?  Below 500,000 units per year, sachets often provide better operational flexibility at lower entry cost. Above 1 to 2 million units, stick pack economics tend to be more favourable for compatible products.

4.      What does your co-packing partner actually run?  Equipment configuration, minimum run sizes, and fill capability at the facility you intend to use should be confirmed before the format is finalised. A theoretically optimal format that requires switching co-packers carries a real operational cost.

PRODUCTION TRIAL

Before committing to a format at commercial scale, request a trial run. Most co-packers with appropriate equipment can produce small test batches that reveal fill weight consistency, seal integrity, and actual production rate with your specific formulation. No spec sheet substitutes for that data.

Working with a co-packing partner who knows both formats

The format decision that appears clean on a comparison chart often encounters complexity when it meets real product and real equipment. Particle size distribution varies across batches. Moisture content shifts seasonally. Fill weight tolerance on a specific machine with a specific auger configuration is not the same as the theoretical spec.

An experienced co-packer brings three things to the format conversation that brands cannot generate internally: knowledge of how their equipment actually performs with products similar to yours, access to run-rate and material cost data that converts format comparisons into genuine unit economics, and an honest read on whether your volume trajectory warrants the format you are considering.

At Western NP Co-Pack, we work with supplement, hydration, and powdered food brands across single-serve formats. Our interest is in matching your product's physical characteristics and your business stage to the manufacturing approach that serves you well now and scales with you. If you are evaluating packaging options for a launch or reconsidering a format that is creating production or cost friction at current volumes, the conversation starts with your formulation, your fill weight, and your volume. Everything else follows from there.

TALK TO A PACKAGING SPECIALIST

Bring your fill weight data, your product formulation, and your volume projections. We will give you a direct, technically grounded assessment of which format serves your product, and connect you with the right manufacturing resources to make it happen efficiently. Visit co-pack.westernnp.com or contact us directly.

10  FREQUENTLY ASKED QUESTIONS

Frequently asked questions

What is the difference between a stick pack and a sachet?

A stick pack is a narrow, tubular pouch formed from a single film strip on a VFFS machine, sealed with a vertical side seam and two horizontal end seals. It is optimized for free-flowing powders in the 1 to 15 gram range. A sachet is a flat, rectangular pouch sealed on three or four sides, capable of holding fills from under 5 grams to over 50 grams across a range of product consistencies including liquids, pastes, and coarse granules.

When should a CPG brand use a stick pack instead of a sachet?

Stick packs are appropriate when the fill weight is under 15 grams, the product is a fine and free-flowing powder, and the consumer interaction involves pouring directly into a liquid. They offer 15 to 25% less film per unit versus equivalent sachets and run at higher throughput on multi-lane VFFS lines. Natural categories include electrolyte mixes, collagen peptides, instant coffee, and fine-grind pre-workout powders.

What fill weight is too heavy for a stick pack?

Most stick pack equipment operates reliably with powder fills between 1 and 15 grams. Beyond approximately 15 to 18 grams, the tube geometry creates practical problems: the pack grows too long to handle comfortably, or the required diameter produces inconsistent sealing and reduced throughput. Brands with fills above this threshold should default to a sachet format.

Are stick packs or sachets cheaper to produce?

At low production volumes, sachets are often more economical because pre-formed three-side-seal sachets can be filled manually without specialised equipment. At scale, stick packs typically win on total unit cost: 15 to 25% less film per unit, higher VFFS throughput, and lighter units that reduce freight and storage costs. The break-even point depends on annual volume, fill weight, product type, and co-packer equipment access.

What is a VFFS machine?

VFFS stands for Vertical Form Fill Seal. It is the dominant technology used to produce both stick packs and sachets at a commercial scale. The machine draws a continuous roll of flat laminated film, forms it into a pouch or tube around a filling mandrel or nozzle, doses product into the formed pack, then heat-seals and cuts the finished unit, all in one continuous vertical motion. Multi-lane VFFS systems run multiple packs simultaneously, reaching throughputs of several hundred to over a thousand packs per minute.

Can a sachet be filled without a co-packer?

Three-side-seal pre-formed sachets can be filled and heat-sealed manually with basic equipment, making them viable for pilot runs, sampling campaigns, and early DTC inventory without a co-packing minimum order commitment. Four-sided-seal sachets and all stick packs require automated VFFS equipment, either owned or accessed through a contract manufacturer.

Western NP Co-Pack   |   co-pack.westernnp.com   |   Packaging Intelligence Series   |   May 2025