Another bit of army kit i use,is the worrior burgan,think its about 70 ltr,dpm or olive drab,padded staps and hip belt.
Also the zip runs from just above its base,left to right,so u can open it fully to gain easy quick access.external straps ,top and bottom acomadate bivie and sleeping bag. Also an internal alloy frame and very strong carry strap at the top.
Had mine since 1995,scrubs up clean,water proof,hard as nails. Holds huge amounts of kit.
Also cyclops rock (burgan) dpm monster bit of kit had mine since 1987, about 90 ltrs,you name it,its been through it and carried 60lbs no probs over 50 miles many times.Still use it on longer sessions,extremley comfy,well padded,scrubs up every time,water proof.