Bosch XL-CART Click and Go Storage System Use with L-Boxx Cases Large load capacity up to 300 lbs Large rubber wheels for easy transport over rugged terrain or up and down stairs Compression strap for secure protection and large base for stable movement Foldable to compact size Compatible with L-BOXX1, L-BOXX2, L-BOXX3, L-BOXX4, L-BOXX3D and L-BOXX1A