3-1-1 liquids bag planner
Free tool
The checkpoint question is never one bottle — it is the whole bag. Add everything you want to bring below and see what passes, what must be checked or bought after security, and what is exempt. Same rule on both borders: TSA (US) and CATSA (Canada) both cap each container at 3.4 oz / 100 ml inside one quart-size (1 L) bag per passenger.
Quick check: one container
💧 3-1-1 liquids rule checker
One quart-size (≈1 L) bag per passenger; every container must be 3.4 oz (100 ml) or less.
Fit is approximate — container shape decides real-world packing. Medically necessary liquids and infant food are exempt: declare them. Packing a whole bag? Plan it container by container →
Build your bag
Tap a shelf item or add your own, then enter the size printed on each label. Saved on this device only — nothing uploads.
Everyday liquids & gels
Each must be 3.4 oz (100 ml) or less, all in your one bag.
Surprises that count as liquids
Spreadable, pourable or gel-core items follow the same 3.4 oz rule at the checkpoint.
Exempt — declare at the checkpoint
Allowed over the limit in reasonable quantities when declared; they never take space in your liquids bag.
Your bag
Your bag is empty — tap shelf items above or add your own below.
Verdict
The rule, verbatim-short:
- Every container ≤ 3.4 oz (100 ml) — the label size counts, not how much is left inside.
- All of them inside one clear quart-size (≈1 L) resealable bag per passenger; the bag must close easily.
- Medically necessary liquids and infant nourishment are exempt in reasonable quantities — declare them at the checkpoint.
- Bought after security (or duty-free in a sealed STEB with receipt): no size limit, it boards with you.
What size bottles can I carry on a plane?
Any container of 3.4 oz (100 ml) or less, as many as comfortably fit inside your single quart-size (≈1 L) clear bag. Container size on the label counts, not how full it is.
What size bag do my liquids have to be in?
A clear, resealable bag of about 1 quart / 1 liter (roughly 6 × 9 in or 20 × 20 cm). One per passenger, removed or visible at most checkpoints.
Do peanut butter, honey and yogurt count as liquids?
Yes — anything spreadable, pourable, or gel-filled (peanut butter, honey, yogurt, creamy cheese, snow globes) follows the 3.4 oz rule. Solid cheese and frozen-solid gel packs do not.
Which liquids don’t count toward the limit?
Medically necessary liquids (including contact lens solution and liquid medicine) and infant nourishment (breast milk, formula, toddler drinks) are exempt in reasonable quantities — declare them at the checkpoint; they do not need to fit the bag.
Do liquids bought after security have limits?
No — anything bought airside (or duty-free in sealed STEB packaging with receipt) can board with you, including full-size bottles.