The Whoop Wrap tanks from Luxfer are here:
85 cu/ft @ 4350 psi throughout life of tank
Inches in Diameter: 7.39"
Inches in Length (85) 21.5", (106) 26.1"
Weight Empty = (85) 28.5, (106) 33.8
Buoyancy Full = (85) -5.10, (106) -4.84
Buoyancy Empty = (85) 1.26, (106) 3.10