honestly for me it can hold 10000ci and have a built in hydration and feel like 10oz when it is holding 100lbs, but if it doesn't hold up to the wear I can put on it I don't care for it.
I don't have anything fancy to tactical or MOLLE or anything like that, I just have a medium A.L.I.C.E. pack with the aluminum frame. Since my dad sells them I get the good ole family discount n heck, our military used them for years, so I figure it'll work for me.