Needed more storage for thread and ordered the Slimline Storage Box. I have two already and was impressed with how well it was made, the uses of the box and that it is slim. The box sides do separate to make them easier to use. It isn't just one very wide box once opened. Separating the sides and reattaching the sides is done easily. The tongs the thread spindles attach to are also easy to use. The slimness of the starage box is great as it does not take up a lot of room on my shelves.