Organizer storage boxes are great for all storage needs. Modular design allows these storage boxes in various sizes to be stacked on one another. Double-wall, single-wall construction offers sturdy support. Medium-duty stacking strength is designed for moderate use with or without shelving. Assembly is easy with Standard Setup Construction. Rolled edges on the box base offer a more finished look. The tuck/roll secures the lid, reinforces it and makes it comfortable to carry.