Flexible, multi-deck storage rack/inventory tower system to hold 1.5ml conical micro tubes, cryogenic vials and other tubes up to 12mm o.d. with maximum height 55mm, in removable racks of 81 (9 x 9 format). Ideal for benchtop transport, or freezer storage, and wet/dry incubation. Polycarbonate construction with very wide operating temperature range, -196°C to +121°C. The small 16 x 16cm footprint minimises valuable space requirements. The internal dimensions of each deck are 142 x 142mm and the standard rack can be replaced by any storage rack, tray or box up to these dimensions and maximum 60mm high. Each deck platform has a front lip to secure the rack or box and the top deck has 2 carry-grips mounted on it to aid portability and to allow 'splitting' of the towers.