Quick answer

Each FlatPak Toiletry Bottle holds 90mL (about 3 oz) and is TSA approved, so a single bottle sits under the 3.4 oz per-container limit. For a typical carry-on, pack two to four bottles — enough for shampoo, conditioner, body wash, and lotion — and keep them in the FlatPak Waterproof Toiletry Case so leaks stay contained. If you want fewer bottles, decant only what you need for the trip.

How much liquid does each FlatPak bottle actually hold?

Each bottle holds 90mL, which is roughly 3 oz. That is below the 3.4 oz (100mL) per-container limit that TSA uses for carry-on liquids, so one bottle equals one allowed container. The soft-sided design means the bottle collapses as you use it, so it takes up less room at the end of a trip than a rigid bottle of the same volume.

How many FlatPak bottles fit in a carry-on?

The practical number depends on your routine, not the bag. Most travelers carry two to four: shampoo, conditioner, and one or two extras for lotion, sunscreen, or contact solution. Because each bottle is 90mL, four bottles total 360mL, which still fits the common 1-quart clear bag rule if you use a bag that size. The bottles are built to travel with liquids like shampoo, soap, conditioner, or lotion, so you can refill from full-size products at home instead of buying travel sizes.

Do FlatPak bottles meet TSA liquid limits?

Yes. The 90mL volume keeps each bottle under the 3.4 oz limit, and the bottles are TSA approved. That means you can carry them in your quart-size bag through security without decanting into a different container. Keep in mind that TSA rules apply per container, so the number of bottles matters as much as the size of each one.

Are FlatPak bottles leak proof for travel?

The bottles are designed as soft-sided travel bottles, and the FlatPak Waterproof Toiletry Case is fully welded with a rolltop closure to keep leaks in and water out. That combination handles shampoo spills and rain alike. No bottle is completely immune to pressure changes or a loose cap, so close each bottle firmly and store them inside the case rather than loose in your bag.

FlatPak bottles vs standard travel bottles: what changes?

Standard rigid bottles hold their shape, which makes them easy to fill but bulky when full and still bulky when empty. FlatPak bottles are ultralight and soft-sided, so they pack down as they empty and take up about half the bulk. The tradeoff is that you fill them by squeezing or pouring rather than standing them up on a counter, and you should check the cap is seated before packing. If you want maximum capacity in minimum space, FlatPak wins; if you prefer a bottle that stands upright on a hotel shelf, a rigid bottle may suit you better.

How do you refill and clean FlatPak bottles?

Refill from your full-size products at home: squeeze or pour shampoo, conditioner, or lotion into the bottle, then close the cap firmly. Because the bottles are soft-sided, you can roll or squeeze them to move thick liquids toward the opening. Rinse with warm water between refills and let them air dry fully before sealing, especially if you are switching products. For a short trip, fill only what you need rather than topping off every bottle.

FlatPak toiletry bottle FAQ

How much does one FlatPak bottle hold?

90mL, or about 3 oz, which is under the TSA 3.4 oz per-container limit. One bottle equals one allowed carry-on container.

How many bottles should I pack?

Two to four covers most routines: shampoo, conditioner, and one or two extras for lotion or sunscreen. Four bottles total 360mL, which still fits a 1-quart clear bag.

Are they TSA approved?

Yes, the 90mL volume keeps each bottle within the per-container limit. No need to decant into a different container for security.

How do they compare to standard bottles?

FlatPak bottles are soft-sided and pack to about half the bulk, but they do not stand upright like rigid bottles. Choose FlatPak for space savings; choose rigid if you want a bottle that stands on a shelf.

How do I keep leaks contained?

Close each cap firmly and store the bottles in the FlatPak Waterproof Toiletry Case, which is fully welded with a rolltop closure. The case keeps spills in and rain out.

Product facts