I use a feildline pro series from walmart runs about 26 dollars its well made and durable. has several outer pockets for things u wanna get to quickly or easily, has an inside compartment for a drinking bladder and a port for your drinking tube, has a removable pack support frame, has heavy nylon attachments on the bottom for additon of a buttpack or w/e you want to attach , has a flip back top with a roll down drybag main compartment, and a main compartment access on the bottom so youdont have to empty the bag to get to something in the bottom, has a chest strap between the shoulderstraps and a waist strap with hip pads, also has a zipping pocket in the flip back top which is were i keep my waterproof survival manuals.