I'm going to Europe this summer for 12-14weeks. I am planning on going from Istanbul to London and lots in between. I have yet to go backpack shopping but have done some e-research. I figure I will need about a 60L/3700cu in. pack and one that has an internal frame to support the load and a daypack of course. So there seems to be quite the diference between the travel packs, which look to be just oversized school packs, and actual hiking backpacks which seem to look more sturdy but I was warned that sometimes they are hard to stuff into lockers and overheads in trains. It seems the best travel packs are Eagle creek and one of the best hiking packs is Osprey, both quite exspensive. Any thoughts, experiences???? Thanks