I bought these as a way to sort out Legos when building with my kid - the felt is very quiet when you dump a big bag of Legos into it, which makes it much nicer than a plastic bin or tray for that purpose. The bright colors make it easy to see different parts, and we use the different sizes and colors for different sizes/colors and quantities of parts. And the slight friction from the felt means parts don't slide around that much when you pick up the trays. Probably would be great for crafts for organizing supplies while working on projects, too.
