>>1595579It's in work config atm. I have some Chinesium pouch for a 1L water/spirit fuel bottle and there is a NATO medium-sized pouch missing that broke about a week back where I used to keep my basha/lunch box (I like this system because it keeps all my food away from my tools). Also have a pair of cheapo molle padded strap comforters and a sternum strap. The bag's spaghetti straps have nylon webbing on them so you can thread straps through them.
My one gripe with the backpack is that there is no possibility of easily attaching a waist belt, which would be beautiful for lugging chainsaws and rope up a hill, but outside of that you really don't need one. I have in the past used a karabiner hook to clip the dangling strap adjusters together.
>>1595691There's a water bladder pouch which also fits the back stiffener, and there's a nylon strap and buckle to support the water bladder if it'll fit. IIRC it is designed for a specific brand of water bladders.