The Sonik SK-TEK Ruckbag is made from a hardwearing material with a Heavy Duty waterproof base. The reinforced, rigid free-standing design and 3 side zip gives easy access. External pockets have been maximised and are sized for the modular Sonik Accessory bags. The square shape of the Ruckbag makes it useable either as a rucksack, carryall or barrow bag.