Depends what is in them. If there is a hand or skin cream that's a brand I like I keep that product and the other stuff just rolls around in a drawer until I throw them out. Some I give to friends. I also sell some on ebay. Some follks happily pay $20 or more to pretend they received it on a flight!! I have sold other travel items on ebay, like first class luggage tags, priority boarding tags/passes and they just get snapped up. I do like to keep 1 new or unopened bag from each airline.