As mentioned by others, I use Plano storage boxes #3600. One useful advantage is you can move the dividers to change the size of compartments. In the past I also ordered extra dividers so more small flies of one kind (nymphs for instance) could be in the same box. If you buy a couple boxes you can also move some dividers from one box to another, leaving larger spaces in your 'streamer' storage. Flies in these 12 boxes are my inventory, which I top up over the winter. Fly BOXES are reloaded from there for the stream.