Because they are modular, you can build shelves of almost any size and orientation (open top, open front, etc.). This gives you many creative options and ways to use them. They're light and strong for the most part (they CAN get overloaded and fall apart, but ligaments seem to help with joint stability). They can be a bit tricky to put together on larger designs, but if you're careful and make sure the pieces are fixed before you load them, they're great. To be honest, this is the third or fourth pack I've bought because of how useful they are for organization and how they look (they're elegant and don't stand out too much).
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