From the Mares Attack Bag range. Built from Extremely rugged material with heavily reinforced construction. To give an example the bag is capable of holding up to 100kg in weight. 

Waterproof for keeping moisture out (or in), and able to double as a washing container for dive gear using a side valve to dump the water afterwards. 

Specs:
90cm x 43cm x 24cm (90litres)
Tear-resistan handle and strap base plates
Waterproof with side valve