I had no idea or at least I didn't really put much thought into the fact that these fit on a walmart shelf... The shelf is adjustable... Someone in my family offered me two shelves instead of throwing them away I thought I would use them for my daughters room... She is now a preteen... We just redecorated her room into a teen style and she LOVES these bins. They come in all colors and styles... We put everything in them. They have a handle on one side... From stuffed animals, lego, to hair clips and make up... She now has one bin for each... Durable... Highly recommend!