I've got one and bought 2 others for my brother. They are pretty generic in sizing, meant to fit the majority of marines. Between 30-probably 40 on belt and relatively normal size height you should be good. It does have load lifters.
I paid $35 for my first. Has no lid and looks like hell, but still completely functional. So much so I carried 2 deer out last season in quarters. Pack lives in the back of my truck. It doesn't carry quite as well as my Kifaru but it's real close and I'm not afraid to leave it in the truck!
