I bought 2 of the single compartment boxes not knowing what I would use them for. I travel a lot and like to bring my fly tying gear with me, these single compartment boxes hold spooled material's and thread spools wonderfully. They will hold 12 spools in one box. I liked them so much I went out and bought 4 more. Now I have my threads aranged by denier and color and with the box being clear I can see everything without opening a box. Being able to find a material quickly and having everything organized saves me time at the vise and stops me from buying duplicate materials.
Great box - many uses. I tie my own flies and use for "give away" fly selections as well as storage of small fly tying items. Ordered when they were first introduced - will order again when more needed.