Structurally they're fine, and can hold a fair amount of weight. Just treat them well; don't cut/drill into them or let them near water (the cardboard gets soft

Structurally they're fine, and can hold a fair amount of weight. Just treat them well; don't cut/drill into them or let them near water (the cardboard gets soft), don't overload them, and don't move/lift them while they're filled with heavy objects. While they're cheaply made, they're not among IKEA's worst products, I think.