Craftsman Tradestack Lockable 21" Tool Box

This toolbox features IP65 water resistance to keep your tools safe from the elements. It also has an automatic stacking system with a drop-and-lock mechanism for easy connecting and disconnecting of units.  The price drops from $49.98 to $34.98. Shipping is free on orders over $35 or for prime members. Otherwise, it adds $6.99.