can you order anything you want to go in it? do you show them the size of the thermos before they decide the charge? if it's on with the order mic before the cashier window, do you ever get to the window after placing the order and they see the thermos size and then change the price? how big is your thermos? do you just give them the thermos body, no cap, and they hand it back to you open? isn't that a liability issue for them? also, is your thermos opening/smell gross?
is this a common thing they do all the time or are you the only one in the world who does it?