This set of bags is one of the few storage solutions produced by Lego itself. The set of 4 includes 3 zip totes and 1 larger tote that unzips into a playmat. It not only gives you an attractive, easy way to store Lego bricks, toys, and other gear, it also provides a mat on which to play with Legos. To use as storage, just place Legos into the smaller bags and zip them up. The smaller bags are deep and narrow and have handles sewn into their tops. All 3 small bags fit into the larger bag (see photo). The larger bag also has carry handles, as well as a buckled strap on top. Everything in this set is great for travel since it's extremely lightweight, zips closed, and has handles. To use as a playmat, just unzip all 4 sides of the large tote and lay it on the floor. The bags are made of recycled polyester. The 3 smaller bags and the outside of the larger bag (the black part) feel like canvas. The inside of the larger bag (the yellow part) feels smooth, almost silky. Lego says this set will hold up to 2,250 Lego bricks. The large tote measures more than 14 inches high x 17 inches wide x 11 inches deep. The small totes measure more than 14 inches high x 5 inches wide x 11 inches deep. This set is NWOT. It was never used, but does have: a small discolored dot on the bottom of the yellow bag; puncture marks from the plastic packaging; a subtle whitish area on the black part of the bag. I included photos of all these things. Purchased from Lego.com for $50, discounted here.