They might come off as "flimsy" because the material is thin but after receiving and re-shipping well over 800 Matsui racks, I never seen or had anyone report a broken Matsui rack that passed through my hands. They are sometime a little difficult to get lined up to interlock but other than that, I never experienced any issues with them as far as durability. I'm confident enough with them that I have all my chips are stored in them now.
That’s good to know! I only have about 10 of them. They do “look” flimsy. But so beautiful, and good to know they’re strong as well.