This rule is where the term 3-1-1 came about (3.4 oz bottles, 1 quart-sized bag, 1 bag per passenger. ), you won't be able to bring it on the flight. All nips below 70% alcohol are allowed.

If your bottles are partially filled, they will not be allowed through airport security, even if the liquid content is below 3.4 oz / 100 ml. There aren’t any restrictions on thermos in checked ...