The Back Pack has a capacity of 5 US gallons (19 litres) and
is 25"h x 16.5"w (63.5cm x 42cm) when empty. Manufactured from a strong
polyester based fabric, protected by a thermoplastic polymer. It has a
4" filling port with a removable debris screen, 3" wide fully padded
shoulder straps. Weighs approximately 40lbs. (18.2kg) when full.