DeWalt ToughSystem tool storage dolly
This system consists of four well-thought-out components: three modular toolboxes and one wheeled carrier.
What we really appreciate is that the components are sold separately, so you can buy as many boxes as you'd like in whichever sizes suit your needs. Made of impact-resistant structural foam, the tough toolboxes stack neatly on each other and also secure individually to the dolly on foldout arms, so you can cart one, two, or three boxes at once. A watertight seal on the lids blocks out water and grit, and the boxes lock onto the rugged wheeled carrier, which can support up to 260 pounds. The arms for the boxes fold down, so you can use the carrier as a hand truck to move supplies and materials, such as cement bags, concrete block, and joint-compound buckets.
Small toolbox: About $50; Medium toolbox: About $60; Large toolbox: About $70; Wheeled carrier: About $190; DeWalt