This is a problem I heard about from a teacher at my daughters school too. We went in for a open house night event and I had volunteered to run a table showing off the STEAM tools, like LittleBits, that we use at home. The teacher said the school had several sets of the Starter and Synth kits and would bring them so we'd have more for folks to play with. When I got there the sets were in complete disarray and many of the bits looked rough. The teacher explained they were having a hard time managing it and that kids were pretty rough on the bits. I agree with @msbrooks, teachers probably need more help/guidance and tips and tricks on how to manage and care for bits in the classroom. I know LittleBits has great kits with storage boxes and also sells them as an accessory, but that might not fit every school's budget. For storage I recommend checking your local Harbor Freight, https://www.harborfreight.com, if you have one. They have low cost storage containers and toolboxes and I've used many of those for LEGOs and small electronics parts.