Quick answer
Use FlatPak Toiletry Bottles for TSA carry-on by filling them to 90 mL or less, sealing the cap tightly, and placing them in your quart-sized liquids bag. Their soft-sided design saves space and meets all 3-1-1 rules.
Why FlatPak Bottles Work for TSA
The FlatPak Toiletry Bottles are designed to be ultralight and flexible, which makes them ideal for carry-on travel. At 90 mL volume, each bottle falls well under the TSA's 3.4 oz (100 mL) limit per container. The soft sides also let you squeeze out air before sealing, reducing bulk and preventing pressure-related leaks in the cabin.
Common Mistakes to Avoid
Overfilling is the most frequent error. Even though the bottle holds 90 mL, filling it to the brim leaves no room for the cap's displacement, which can cause leaks. Another mistake is forgetting to remove air before closing the cap — trapped air expands at altitude and can force liquid out. Finally, placing the bottles loose in your bag instead of inside a clear quart-sized bag can lead to a security checkpoint delay.
How to Pack FlatPak Bottles for TSA Carry-On
- Fill to 90 mL or less: Pour your liquid into the bottle up to the 90 mL line. Do not overfill — the cap takes up internal volume and can cause spillage if the bottle is too full. Leave a small air gap at the top to accommodate the cap.
- Remove air and seal tightly: With the cap off, gently squeeze the bottle to push out excess air until the liquid reaches the opening. Then screw the cap on firmly. This reduces internal pressure and minimizes leaks. A common mistake is sealing without removing air — trapped air expands at altitude and can force liquid out.
- Place in a quart-sized bag: Put the sealed bottles into a single clear, quart-sized, zip-top bag. Each passenger is allowed one such bag. Arrange bottles flat to maximize space and make inspection easy. Do not pack bottles loose in your carry-on — TSA requires all liquids under 3.4 oz to be in a single quart bag.
- Store the bag in an accessible pocket: Place the quart bag in an outer or top pocket of your carry-on so you can pull it out quickly at the security checkpoint. This avoids rummaging through your bag. If the bag is buried, you may be asked to open your entire pack, slowing down the line.
Product facts
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FlatPak™ Toiletry Bottles: The FlatPak Toiletry Bottles are ultralight, soft-sided bottles with 90 mL volume — half the bulk of rigid bottles. The soft sides let you squeeze out excess air before sealing, which prevents leaks and saves space in your carry-on liquids bag.
FlatPak™ Toiletry Bottles
