I've beat up an Osprey I was given pretty good for a few years now and I've mostly done cold weather bushwhacking in thick forests with it loaded tight, so I'll vouch for the durability.

It's not what I'd call "comfortable", but it wasn't fitted for me and I don't generally do a lot of miles so it's not been a problem for me.

Aside from that, what OM said...

"You want to go where?"