12 Pcs Clear Hard Zipper Case Plastic Zipper Pouch with 5 Sheets Alphabet Stickers Double Toy Storage Organizer Makeup Case for Travel Building Blocks Puzzles Cosmetic(5 x 5 x 2”)

I like these as an upgrade to the zip bag. They're hard sided so they stack well or can slide in vertically like a book on a shelf, but not as bulky as a box with a lid to manage. They come in many sizes so you can get a variety to fit different sets. https://www.amazon.com/dp/B0FPKSQ3VG?th=1 or https://www.amazon.com/dp/B0F6L9QCT2 Also, if you have a Daiso near you, it's worth it to go check out their storage box section if you have access to one of their larger stores. I can't find the listing on the US site, but I got several of these boxes which stack nicely and don't have bulky lids so the look is very uniform: https://shop.daisosingapore.com.sg/products/4549131590685