The bags are constructed with a rugged clear 20 mil. vinyl, making locating gear and equipment a snap. They feature a three-roll closure with a D-ring for lashing to boats, other packs and bikes; a heavy-duty bottom; and reinforced side wrap for durability.
Bottom is color-coded by size.
XS/Grey - 6" diameter x 10" height    300cu.in.    5 liters    7oz
SM/Yellow - 7.5" diameter x 15" height    600cu.in.    10 liters    9oz
MD/Blue - 9.5" diameter x 18" height    1275cu.in.    21 liters    14oz
LG/Green - 11.5" diameter x 24" height    2500cu.in.    41 liters    1 lb.5oz
XL/Red - 12.5" diameter x 28" height    3500cu.in.    57 liters    1 lb. 9oz