Take the TSA, for example. They say that you can bring a mug in your carry-on if the travel mug or tumbler is empty, doesn't resemble a weapon, and has no sharp edges or features. So yes, you can bring a travel mug on a plane.
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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.
Yes, however, some customers have told us going through TSA they have to be empty. When you fill it up, do not fill it up all the way for the plane ride. Leave some room for pressure.
The only condition for hydro flasks to be allowed through security is that they must be completely empty of any liquids. That's because all liquids in hand luggage have to follow the 3-1-1 rule and hydro flasks usually are too large to fit in a 1-quart bag, and their volume is above 3.4 oz / 100 ml.
Aerosol cans (except limited quantities of personal care items that are 3.4 ounces or less), butane, fuels, gasoline, gas torches, lighter fluid, strike-anywhere matches, flammable paints, turpentine, paint thinner, arc lighters, plasma lighters, electronic lighters, E-lighters, and replicas of incendiaries cannot be ...
Pack a Refillable Water BottleYou can't avoid them if you want to explore the world. One simple trick I've used to improve the experience is to pack an empty water bottle. Once you pass through security, just fill it up at a water fountain and bring it on the plane.
You can bring metal or stainless steel water bottles on to plane in both the carry on and checked luggage. When carrying in hand luggage, water bottles must be empty to pass through airport security as liquids of 3.4 ounces (100 millilitres) or greater per item are prohibited.
Makeup And The 3-1-1 TSA RuleLiquids, like foundation, nail polish and moisturizer, are subject to the 3-1-1 rule. Items like powder blush or foundation, do not. Sometimes that are a bit more confusing are mascara and lip gloss. These are considered liquids.
Liquids, gels and aerosols packed in carry-on must follow the 3-1-1 liquids rule: 3.4 ounces or less per container. 1 quart size, clear, plastic, zip top bag (all liquids must fit in bag) 1 bag per passenger.
Water for babies is allowed in reasonable quantities in carry-on bags. Remove this item from your carry-on bag to be screened separately from the rest of your belongings.