Best products from r/ProBendingArena

Baggies are obviously the cheapest storage solution. I believe the game comes with a handful, so you don't even have to spend any extra money.

The next best thing is Plano boxes. They're likely the plastic tackle boxes you're talking about. Amazon should have them, as should any local Walmart, sporting goods store, and even some craft stores. Something like this one should work well for lots of games, but I haven't done any measuring and you might want a smaller one for Pro-bending.

If you want a hobby within a hobby, look up how to DIY foamcore inserts. See r/foamcore if you want to dive down the rabbit hole. Foamcore inserts are custom inserts you design and build yourself. This can get expensive and is rather time consuming, so first-timers beware. But it's the only way to get the exact type of insert you want.

The pièce de résistance are wooden inserts from companies like the Broken Token, Meeple Realty, etc. These things are always very well designed, but usually very expensive and a bit heavy. At the moment, I don't believe there are any of these designed yet, nor do I know of any companies with plans to design a Pro-bending insert.