Yes. If it's empty at security. Empty water bottles, Stanley cups, Hydro Flasks and tumblers are allowed in carry-on; fill them after the checkpoint. Water over 3.4 oz (100 ml) is not allowed through security.
Empty drink containers of any size are allowed through the checkpoint and can be filled afterward. A filled bottle can only pass if it holds 3.4 oz (100 ml) or less.
Empty or full bottles are allowed in checked bags.
Checked against official TSA, FAA and government pages on . These are US rules unless we say otherwise; the TSA officer at the checkpoint makes the final call.
The rules in numbers
- Empty bottles/tumblers: any size allowed in carry-on
- Water or other drinks in carry-on: 3.4 oz (100 ml) max
Packing tips
- Dump the water before the line, not at the X-ray belt, and pull the bottle out to show it's empty.
- Buying a drink after security is also fine; anything purchased past the checkpoint can be taken on board.
- Water for babies is an exception: reasonable quantities are allowed but screened separately.
Questions people ask
Can I bring a Stanley cup on a plane?
Yes. An empty Stanley cup or other tumbler is allowed in carry-on; fill it after security.
Can I bring a full water bottle through TSA?
No, unless it's 3.4 oz or less. Empty it first, then refill past the checkpoint.