Antique hip flasks, particularly those made of silver, are now sought-after collector's items.
I should imagine that hip flasks to beer cans exist in the ratio of 1:100.
Hip flasks would not be caught because they are not normally returnable, but they can cause injury if thrown, but so can thermos flasks.
Not many of my constituents attend football matches and take hip flasks with them.
We are not aware of any mischief involving hip flasks at football matches.
For example, it was felt that hip flasks should be allowed into the grounds.
A hip flask is most commonly purchased, and then filled by the owner.
The naggin bottle is typically the shape of a large hip flask, suitable for placing in a pocket.