My preteen is LEGO obsessed she has 8, 4x2 plastic LEGO storage containers so when her toddler brother got into diploma I thought id start him on his LEGO storage stash. Oh man, you can fit like 5 duplos in those bins... dramatization but for real though... I decided to try this out instead for my toddler and I’m impressed. First, it fit 3, 4x2 LEGO storage brick containers full of duplos before it was full. Second, this is a much more logical way for toddlers to play with duplos than LEGO storage bricks. I’m happy.