Travel sizes are a dependable, repeat-purchase tier — but the hard constraint is the 100 ml carry-on limit. Here is how to assemble a kit that is coherent, legal and on-brand.
What this formula needs from its bottle
Every bottle must be 100 ml (3.4 oz) or less per item to clear cabin rules. A useful kit pairs a 50 ml treatment/dropper, a 100 ml lotion or shampoo, and a small mist. Matching neck finishes (e.g. 24/410) keeps closures interchangeable across the set, and one masterbatch colour makes it look designed rather than cobbled.
Bottles we make for this use
From our catalog we already produce 3 matching configuration(s) — see the images above. Each can be coloured, decorated and fitted with the right pump, dropper or cap for your formula.
Practical tips
- Anchor the kit on 50 ml and 100 ml bottles — both are carry-on compliant.
- Match neck finishes across formats so pumps and caps swap easily.
- Use one masterbatch colour across the set for a designed, branded look.
- Sell the set as a gift or trial acquisition to lift basket size.
Industry signal
These Editor-Tested Travel Toiletry Bottles Are TSA-Approved and Leakproof – Condé Nast Traveler — recent coverage reinforces the move toward better travel packaging practice.
Related: cosmetic bottles.
The TSA rules, stated precisely
The carry-on rule is 100 ml (3.4 oz) or less per container, and all containers must fit in a single clear quart-sized bag. The limit applies to the container size, not the amount inside — a half-empty 150 ml bottle is still non-compliant. Both 50 ml and 100 ml bottles qualify, which is why they anchor a travel kit.
Beyond compliance, the real risk is leakage under cabin pressure. Choose tight, well-threaded closures and test the filled bottle through a pressure cycle, not just a bench test.
A kit that looks designed, not cobbled
- Anchor on 50 ml and 100 ml — both carry-on compliant.
- Match neck finishes (e.g. 24/410) so pumps and caps swap across the set.
- Use one masterbatch colour across the kit for a branded, intentional look.
- Sell it as a gift or trial to lift basket size and introduce the full-size range.
A coherent travel kit is a brand statement the customer carries with them — and reorders when they come home.
Buyer checklist before you order
Lock these four things before requesting a quote: the fill volume and the headspace you need above it; the closure type (dropper, pump, spray or cap) and its neck size; the decoration (silk-screen, hot-stamp or label); and the certification your market requires.
Getting the neck finish right first saves the most time — it decides which closures will ever fit, and it is cheaper to confirm than to re-tool.
Common sizing mistakes
| Model | Material | Capacity | Neck |
|---|---|---|---|
| SJT0013 | PET | 13 ml | 32 mm |
| SJT0181 | PET | 181 ml | 24 mm |
| SJT0366 | PET | 366 ml | 24 mm |
| SJE1808 | PE | 120 ml | 20 mm |
The usual error is specifying the bottle by its marketing size (a ’50 ml’ bottle) while the closure and label were specced for a different neck. Match the declared capacity to the actual internal volume, not the printed number, and the fill line stays clean.
The second mistake is ignoring headspace. A viscous product needs more air above the fill than a thin one, so size the bottle to the fill plus the space the capper and shipper require.
From decision to first sample
Once the size, material and closure are set, ask for a stock-mold sample rather than waiting on a custom tool. You can validate the bottle on your own line in days and confirm the closure seats before any tooling commitment.
Bring the actual formula to the sample call — a bottle that looks right empty can behave differently once filled, and the real fill is what the stability and drop tests should run against.
If you only remember one thing
Specify the neck finish before anything else. It is the one dimension that locks the closure, the capper and the label, and fixing it late is the most expensive change in the whole programme.
Everything else — colour, decoration, even the exact capacity — can flex around a confirmed neck.
Frequently Asked Questions
What size is TSA-compliant?
Containers of 100 ml or less per item are carry-on compliant; 50 ml and 100 ml bottles both qualify.
Can travel bottles be custom coloured?
Yes — the same masterbatch colour used on your full-size range keeps the travel kit on-brand.
What size bottle is TSA-compliant?
Containers of 100 ml (3.4 oz) or less per item are carry-on compliant — the limit is on the container size, not the amount inside.
Can travel bottles be custom coloured?
Yes — the same masterbatch colour used on your full-size range keeps the travel kit on-brand and part of the family.
Explore our full bottle catalog or contact our team for custom tooling and low-MOQ production runs.