I already have this HUGE backpack, its frameless but holds something like 5000cu in. It has a zip off day pack which is handy. I’ll be in europe for 3 months doing the usual. I’ve taken it there before but never had to lug it around for more than a week. Its from eagle creek so its really good quality. (its the world journey bag). it has nice comfy straps, waist and chest belts (whatever they’re called). And i’ve taken it on trains.
My only concern is that it’ll kill my back after 3 months.

Should this be okay? I was tempted to buy a pack with a frame but who wants to spend an extra $200 when I’m already gonna go broke?