Travel Mug
An empty travel mug has no restriction; a mug filled with liquid follows the standard 3.4 oz carry-on rule.
Carry-on
Allowed with conditions
Checked
Allowed
Carry-on details
Allowed. An empty travel mug has no restriction and can go through security freely — this is the normal way to bring one, since you can fill it with water or coffee after the checkpoint. If it's already filled with a beverage when you reach security, that liquid must be 3.4 oz or less, or you'll need to finish or discard it before screening.
Checked-bag details
Allowed. No restriction in checked baggage, empty or filled.
Quantity limit
100 ml (per container)
Special instructions
Bring it empty through security, then fill it at a water fountain or shop past the checkpoint — this is standard practice for reusable bottles and mugs alike.
Related rules
FAQ
- Can I bring my travel mug already filled with coffee through security?
- Only if it holds 3.4 oz or less. Otherwise, bring it empty and fill it after the checkpoint, the same as a reusable water bottle.
Related items
Source: TSA — What Can I Bring? · Last verified: 2026-08-02
Final decision rests with the security officer at the checkpoint.