An ul backpack under $200 in material costs. Top is based off of a roll-top drybag. Shape and dimensions based off of a 36 liter backpack. An mini ul foam pad is used as back padding and also comes off bag easily to use as a seat in camp. Weighs a total of 1.7 lbs. The straps and hip belt are extra parts bought through Gregory. Both are removable and the heaviest part of the bag (so it could be updated with ul straps). There is a removable CIRCUIT & OHM 2.0 FRAME from ULA Equipment which gives the right tension for the hip belt and shoulder straps although I think under 10 lbs. it might still be comfortable without this.