What goes wrong

The material was wrong for the contents

Updated October 2026

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The decanting problem in one line PET and alcohol HDPE for the harder contents Thin walls and squeezing Labels lift in a wet bag Light, for the ones that need it Say what the set is for An empty bottle is sold without its contents known References

A travel bottle is often filled with something the bottle was never specified for.

The decanting problem in one line

A travel bottle is sold empty, so the maker does not know what will go in it. 142 of the 203 containers here are PET and 61 are HDPE, and those suit different contents.

PET and alcohol

A perfume or a high-alcohol toner in PET is the common mismatch. It will hold for a trip and it is not a storage container, and that distinction is worth putting in the copy rather than leaving to chance.

HDPE for the harder contents

More tolerant of a wider range of chemistry and opaque, which also protects a light-sensitive product. For a decant set intended for anything, HDPE is the more forgiving default.

Thin walls and squeezing

A travel bottle gets squeezed to get the last of the product out, and a thin wall that has been softened by its contents deforms permanently. Then the closure no longer seats on a round neck.

Labels lift in a wet bag

A wash bag is damp, and a label that survives a bathroom shelf does not necessarily survive that. For a sold decant set, supplying write-on labels that tolerate water is a small addition that solves a real problem.

Light, for the ones that need it

36 amber containers on this shelf against 35 clear and 60 white. For a sunscreen or a vitamin-C serum decant, amber is doing conservation work rather than looking considered.

Say what the set is for

A decant set described as suitable for shampoo, lotion and sunscreen is accurate and useful. One described as suitable for anything invites exactly the mismatches on this page.

An empty bottle is sold without its contents known

Which is unique to this property. Every other shelf in this library is chosen by somebody who knows what is going in it, and a decant set is chosen by somebody who does not yet. That is why naming the suitable contents matters more here than anywhere else.

References

49 CFR 173.150, Exceptions for Class 3 (flammable and combustible liquids), the limited quantity provisions that reach a high-alcohol product such as a perfume decant, with inner packaging limits of 0.5 L, 1.0 L and 5.0 L by packing group and a 30 kg gross cap per package. law.cornell.edu

29 CFR 1910.1200, Hazard Communication, which sets what a shipped container of a hazardous chemical carries and requires a safety data sheet. law.cornell.edu

Written from federal regulation and from measured catalog data. The hazardous materials figures here are from 49 CFR 175.10 and are current as cited; the carry-on liquids limit is a TSA security requirement that changes without a rulemaking, so check TSA rather than any secondary source including this one. Airlines may also impose their own conditions.