Stick-Pack & Sachet
Single-dose flexible packets — a slim stick or a flat sachet — formed on FFS machines from barrier film. At single-serve, the net weight is the dose, so small-fill accuracy is a content-uniformity question.
One serving, sealed in barrier film.
Stick-packs and sachets are small single-dose flexible packages. A stick-pack is a narrow, tall tube — typically three-side or fin-sealed — for one serving of powder or liquid; a sachet is a flat four-side-sealed packet for the same. Both are made on FFS machines from barrier film and built around single-dose convenience and barrier protection of a small fill.
The format is all about the single serve — pocketable, pour-and-go, fresh every time — which puts unusual weight on getting a very small fill exactly right and sealing it perfectly.
The levers are fill accuracy at small dose, seal integrity, film barrier, and machine speed. The small target is the hard part: at single-serve, a fill that drifts a fraction of a gram is a dose that drifts — and a hygroscopic powder behind a marginal seal spoils fast because there’s so little of it.
Barrier film is specified for the small, often hygroscopic fill, formed on stick or sachet FFS with longitudinal and end seals, dosed to the single-serve net weight, then sealed, cut, and coded into individual units.
Process flow
Barrier film specified for the small, often hygroscopic single-dose fill
Formed on (vertical) stick or sachet FFS; longitudinal and end seals made
Dosed (auger/volumetric for powder, pump for liquid) to the single-serve net weight
Sealed and cut to individual units; coded
Single-dose stick-packs or sachets
At single-dose, the net weight is the dose.
Because each pack is one serving, fill accuracy on a small target is a content-uniformity issue, not just a fill question — an under- or over-filled stick is an under- or over-dosed serving. And a hygroscopic powder makes barrier and seal integrity critical, because a tiny leak ruins a small fill fast: there’s no margin to absorb moisture ingress.
High line speeds make marginal seals and fill drift easy to miss without monitoring — the failures are small and frequent rather than dramatic. The discipline is tightly monitored small-dose fill weight tied to content-uniformity needs, seal-integrity testing on the narrow stick and sachet seals, a barrier film matched to the fill’s sensitivity, seal-zone contamination control at speed, net-content verification across the run, and film substitutions requalified for barrier.
Food-contact film under 21 CFR 174–178; drug single-dose uniformity under USP <905>; net-content accuracy and seal integrity anchor the rest.
Why a maker chooses single-dose — and what they trade.
The stick or sachet sells convenience and freshness per use. Knowing the choices around it tells you the cost.
Stick vs. sachet
Sticks are slim and pocketable (pour into water); sachets lay flat and tear open.
Multi-dose pouch or bottle
A multi-dose pack is cheaper per gram.
Effervescent tube / capsule
Tubes and capsules are alternative single-dose formats.
The gaps a reviewer looks for on a stick or sachet.
None of these are exotic. They’re the quiet places small fills and narrow seals drift unseen — recognizable the moment you’ve run a stick machine.
Small-dose fill weight isn’t tightly monitored — at single-serve, weight is the dose.
Seal integrity on narrow stick seals isn’t tested — leakers ruin a small fill quickly.
The barrier film is inadequate for a hygroscopic or oxygen-sensitive single dose.
Powder bridging or contamination in the seal zone at high speed.
Net-content compliance across the run isn’t verified.
Film substitution without barrier requalification.
Six things to check against your own records.
Not an audit — a read you can run yourself before anyone else does. Pull one recent run and walk it.
Ask how single-dose fill weight is monitored and whether it meets content-uniformity needs.
Check seal-integrity testing on the stick and sachet seals.
Confirm the barrier film suits the fill’s sensitivity.
Review seal-zone contamination controls at line speed.
Look at net-content verification across the batch.
Verify any film change was requalified for barrier.
The same format, across very different fills.
The fill changes — the discipline never does: nail the small dose, test the narrow seal, match the barrier.
Powder & electrolyte sticks
Single-serve drink-mix, electrolyte, and greens sticks, where small-dose accuracy and moisture barrier are the controls.
Unit-dose powders & granules
Single-dose oral powders and granules where net weight maps directly to drug content uniformity.
Condiment & instant sachets
Sugar, coffee, condiment, and seasoning sachets, where fill accuracy and seal hold across a fast line.
Sample & single-use sticks
Single-use cosmetic and personal-care sticks and sachets, where the barrier protects a tiny fill to point of use.
Know the process. Now decide how far to take it.
These doors connect to this technology. None outranks another — pick the one that fits where you are.
Training
A course on stick-pack and sachet packaging and the standard it has to meet — so your team understands small-dose fill accuracy, seal integrity, and barrier choice before they run or review the step.
Browse trainingService
Send us one record from this step — a fill-weight log, a seal-integrity test, a net-content report — and get a written read on whether it holds up, and what would close the gap.
See servicesAssessment
Your held documents for this step graded against the standard’s rubric — a readiness matrix of what passes, what’s a gap, and what’s at risk.
See assessmentsProgram
A complete, buy-and-go document system for the standard this step has to satisfy — download it all, or follow the guided build. No meetings required.
Explore programsConsulting
When the productized options don’t fit — a scoped, senior review of your situation and a written path, by inquiry.
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