The ink pad storage towers work well and keep my ink pads neat and organized. I have 4 - 2 packs, meaning 8 containers total. I stack one on top of another. They are sturdy and stack well. I have only filled 3 so far. I purchased them on sale and they are worth the money. I have various types of ink pads, Stampin' Up, Distress Inks, small ink spots, and several other brands. They all fit in the containers.