Sooyee 3-Layer Things & Crafts Storage Box with 30 Adjustable Compartments for Organizing Washi Tape, Embroidery Accessories, Threads Bobbins, Kids Toy, Nail Polish, Jewelry - Large

https://a.co/d/0den9irw This is what I use! They all stack together pretty perfectly. Sometimes they come a little misaligned in the box but nothing you can't fix. The dividers also come out so you can make one part of the box bigger! I have over 50 nendos and I keep ALL of their parts in these boxes. Super super handy especially when you need a lot of storage but don't have a lot of space.