I am not sure. I will package and weigh it for whomever wins the auction. If it is cheaper to send it via flat rate I can do it that way or the snail mail method! If I had to guess, it shouldn't be any more than 5 bucks.
There are no stains on it at all:) I haven't had a chance to get it weighed yet, I know it's pretty light, the only bad thing is the size of it:P The thermos looks brand new still. To be honest, I don't think my daughter ever even used it:)