Black storage is for the stuff you need close at hand but don't want to look at: remotes, chargers, kids' art supplies, the twelve tangled cables nobody can identify. A box or basket in black does the same job as any other color, it contains clutter, but it also reads as furniture rather than as a container, so it sits on open shelving or under a console without announcing itself as storage at all.
Before you buy, check the thing the way you'd check anything you're about to pay for and carry home. Pick it up and feel the weight, because a cheap resin or plastic bin in black often weighs less than it looks like it should, which usually means thinner walls that flex and eventually crack at the corners. If it has a lid, open and close it a few times, a lid that doesn't sit flush or that rocks on one corner will annoy you every single day. For woven baskets, run a hand along the inside, loose threads or a rough weave near the base mean it'll shed fibers onto your floor for the first few months. And look at the black itself up close under the shop lights, because cheaper plastics fade unevenly to a chalky gray in sun long before anything structural fails.
Where black storage falls short is in small, bright rooms with little natural light, a deep black bin in a windowless hallway or a tiny bathroom can make the space feel smaller rather than tidier, and it will show dust and lint far more than a lighter color would. It's also not the one to choose if you want the contents visible at a glance, obviously, so anything you reach for without thinking, school forms, dog leads, is better in something open or clear.
It earns its place best in rooms that already lean dark or moody, a living room with navy walls, a study with black hardware, a bedroom going for a hotel sort of calm. It also works well as the one grounding note in an otherwise pale, Scandinavian feeling room, where everything else is oak and linen and the black box stops it tipping into too soft. Over time, plastic versions hold up fine with a wipe down, while woven ones need an occasional vacuum on the low setting and a spot clean rather than a soak, water tends to leave the black looking patchy and uneven.
I'd start with one in the living room, on the shelf under the coffee table, holding whatever would otherwise be all over the floor by Friday.