Ali review
Empty space under a closet shelf can work better as a pull-out mesh basket
AliExpress under-shelf pull-out wardrobe basket review covering shelf thickness, hinge clearance, pull-out space, light loading, rail-mounted baskets, and stackable basket comparisons.
Closet shelves often leave awkward vertical gaps. Small socks, scarves, belts, and hand towels get pushed to the back, but a full storage box can be annoying because the whole box has to come out. In that kind of space, a shallow under-shelf pull-out basket can make more sense than adding another drawer unit.
The main option here is this under-shelf pull-out mesh basket. Based on the product photos, it hangs below a shelf and works like a shallow drawer, so it is best treated as a light wardrobe divider for small folded items.

Shelf Thickness And Hinges Come First
Width is not enough. Shelf thickness, the front lip of the shelf, cabinet depth, and door-hinge position all matter. A basket can hang under the shelf and still become useless if it hits the hinge when pulled forward.

Measure the usable inside width, not the outside width of the wardrobe. Also check what sits below the shelf. This basket uses the space under the shelf, so it reduces vertical room for items or clothing already there.
The Pull-Out Path Has To Stay Clear
For a pull-out basket, the extended position matters more than the closed position. Check whether it hits the door, hinge, hanging clothes, side wall, or anything stored below when it is halfway out.

If the basket will be pulled hard every day, a rail-mounted design may be more suitable. If it only holds socks, scarves, and small accessories used occasionally, the simpler hanging style is worth a look. The main point is keeping the slide path clear.
Keep It For Light Items
This is not a new heavy shelf. It is a shallow helper basket for small items. Socks, scarves, small towels, thin belts, and a few light folded shirts are more reasonable than dense stacks.

Avoid stacked jeans, thick sweaters, blankets, books, tools, or anything that concentrates weight in one spot. The weak point may be the shelf edge, hook area, mesh joint, or cabinet board rather than the basket body. A little empty space makes it easier to use.
Rail-Mounted Baskets Need More Precision
A rail-mounted pull-out storage basket is the obvious comparison. It may feel steadier than a hanging basket, but the rails need to be aligned cleanly, and the cabinet needs enough depth and side clearance.

A no-drill metal mesh under-shelf drawer is another related option. Metal mesh can look sturdier, but it can rub shelf surfaces or rattle if overloaded. No-drill does not mean unlimited loading or universal fit.
Stackable Baskets Are For Lower Shelves
If your closet cannot accept an under-shelf hanger, stackable pull-out wardrobe baskets are a different route. They sit on a lower shelf, so shelf thickness is less of an issue, but they use more vertical height and front pull-out space.

With stackable baskets, heavier clothing should stay lower and lighter accessories higher. A narrow closet or nearby drawer unit can block the pull-out path. What matters is not just how tidy the stack looks, but whether each level is easy to open.
Verdict
The under-shelf pull-out mesh basket is worth a look if the space under a closet shelf is unused and small wardrobe items keep mixing together. Treat it as a light helper basket, not a heavy drawer replacement.
Check shelf thickness, inner width and depth, door hinges, and clothing clearance first. If it can pull out cleanly and you keep the load light, it can turn dead space under a shelf into a useful sorting layer.