Manfactured from High Density Polyethylene these storage boxes are extremely robust and are highly impact resistant. There is a family of 3 boxes ranging in size from 90 litres to 240 litres. They are designed to be modular, and they stack and interlock into each other. The lid is a double wall structure and has a non-slip surface to stand on. The clasps which keep the lid closed are lockable with a small padlock. The lid is recessed to allow for the use of a rachet strap to tie them down if required.