I remember once seeing a trumpet case that could fit 4.5 trumpets, mutes, and still have room for schoolbooks that would be a great backpack to have in college, but I can`t find it online now that I want to buy it. Is my memory deceiving me or is there such a wonder-case and if so, where can I get it? Thanks.

Did You say it fits 4 trumpets?
My case is big and it only fits 1, I wonder how big tis case is.

OK, let`s say carry 4 trumpets in this bag with the average weight being around 3 Lbs. That`s 12 Lbs so far. plus 5 Lbs of books to make it 17. Throw on another 3 Lbs of mutes and you`ll have a 20 pound bag. Carrying this bag around on your back would be hell (unless it has wheels). In that case (no pun intended), I think Jens Lindemann has a multi-horn case that rolls like a luggage container. Ask him about it.