The Best Travel Toiletry Bottles

Capacities and prices read from each maker’s published material and checked 9 September 2026. TSA figures are the published 3-1-1 rule. We have not tested these bottles.

The rule that fixes the size of the problem

Before any product: the TSA publishes 3-1-1. Containers of 3.4 fl oz (100 ml) or less, in one quart-sized clear resealable bag, one bag per passenger.

Two things follow that people consistently get wrong. The cap is per container, not a total volume — a half-empty 8 oz bottle is not allowed and a full 3.4 oz one is. And the quart bag is the real limit: it is about 0.95 L, so it holds roughly six to nine bottles of this size once you account for their shape. The 3-1-1 rule in full.

Which means the useful question is not “which bottle is best” but what does it cost to fill the allowance you are given. That is answerable from published figures, and the answer is startling.

Cost per fluid ounce of capacity

A factor of six, for containers doing the same job under the same rule. Put it in terms of an actual kit — shampoo, conditioner and body wash, about 10 fl oz between them:

This is not an argument that Cadence is a bad product. It is an argument that it is not a capacity product, and it is sold in a category where capacity is the whole point. If you want the magnetic modular system, buy it knowing what it costs per ounce.

Who publishes what

Matador is the outlier and it deserves credit for it: capacity, weight, dimensions, fabric and a warranty term, all published. Two of the three publish no weight at all, which on this site costs them a scoring axis rather than being quietly overlooked. What a missing input does to a score.

Buy to the ceiling, not below it

The most common and most expensive mistake in this category is buying containers smaller than the rule allows.

You are permitted 3.4 fl oz per container. A 1.32 fl oz capsule uses 39% of the allowance each container is entitled to, so you carry two and a half times as many objects for the same volume of product — more things to fill, more things to leak, more of the quart bag consumed by container walls rather than by shampoo.

The exception is genuinely small quantities: a serum you use three drops of does not need 3.4 oz of bottle. That is what the small sizes are for, and it is a real use rather than a rationalization.

Soft pouches against rigid bottles

• Soft pouches — the Matador — pack flat when empty and collapse as you use them, so they take less of the quart as the trip goes on. At a published 0.41 oz it is the lightest way to carry a liquid. The trade: harder to dispense precisely, and a pouch that has gone flat is harder to stand up in a hotel bathroom.
• Rigid and semi-rigid bottles — the GoToob+ — stand up, squeeze empty and take a wide opening for refilling. The trade: they occupy the same space in the bag whether full or empty.
• Modular capsules — Cadence — clip together so they cannot scatter through a bag, which is a genuine problem the category otherwise ignores. The trade: the cost per ounce above.

The bottles are not the constraint; the bag is

Whatever you buy, the quart bag caps you. It is worth being clear about the relationship between the bottles and the toiletry bag they live in, because they are frequently confused.

A 4.5 L hanging toiletry bag — the BAGSMART Blast publishes exactly that at 0.66 lb — is not a liquids allowance. It is a bag for the solids, the cosmetics and the quart bag together. Your liquids are still capped at 0.95 L no matter how large the bag around them is. The toiletry bags ranked.

What to buy

• Filling a 3-1-1 quart economically → humangear GoToob+ in the large size. Exactly at the container ceiling, the lowest published cost per fluid ounce here. Its con: no published weight, dimensions or warranty term, and silicone holds the smell of what was in it before.
• Counting grams, or wanting a real spec sheet → Matador FlatPak at a published 0.41 oz with a 2 year warranty. Its con: 3 fl oz leaves a little of your allowance on the table, and $5.00 per fluid ounce is the middle of the field.
• Small quantities of expensive product → Cadence, with your eyes open about the arithmetic. Its con: about $18 per fluid ounce, and nothing published beyond a price and a leakproof claim.
• Cheapest possible → the free option is decanting into containers you already own. Nothing in the published rule requires a branded bottle; it requires a container of 3.4 fl oz or less.