ACCEPTING OFFCER SO DON’T BE SHY This is an ultra light carbon fiber tank. It is 4500psi, 100 cubic inches (the largest on the market) which means you can go for days without a fill. I took this to a 3 day nonstop Millsim West even and used it the whole time with 1000 psi left. Take your ups build to the next level with this sick tank! (I’ll split shipping $4 each)