This is the stuff that comes into its own around late fall, when everyone's pulling out the winter sweaters and extra blankets and suddenly the closet shelf that looked fine in June is a landslide waiting to happen. You need something soft sided that can get shoved onto a high shelf or under a bed without scratching anything up, and a fabric bin does that job quietly, no drama, no sharp corners.
Getting the size right is the part people mess up most, and I include myself in that, because I once bought a set of bins for a closet shelf without actually measuring the shelf, just eyeballed it, and ended up with bins that fit the width fine and then stuck out two inches past the edge like a shelf of loaves of bread about to fall. Measure the actual space, not the space you remember, and leave a little room on top for lifting the bin out without scraping the shelf above. Go a size up rather than down if you're between two, because an overstuffed fabric bin loses its shape fast and starts leaning like it's had a long day, where one with room to breathe keeps its square corners and actually stacks properly.
Where it falls apart is anywhere damp or anywhere you need to see what's in it at a glance. A fabric bin in a bathroom cabinet near the shower is asking for a mildew smell you won't notice until it's bad. And if you're the type who needs to find the exact charger cable or the specific scarf without digging, the opaque sides work against you, you'll end up pulling three bins down before you find the right one. It's also not the move for anything heavy, books, tools, anything with real weight, because the sides sag and the handles take the strain in a way that gets old fast. That's a job for something rigid.
If you've got none of these yet, start with one or two in a plain neutral color before you commit to a whole shelf of them, because the patterned ones look great in isolation and start to feel busy fast once you've got six in a row. Go for one with a stiffened base, the kind that sits flat on its own rather than slumping, and a lid if the shelf is open to view, since a closed top hides a multitude of sins. You'll know it's a decent one by the sound it makes going down, a soft thud rather than a cheap crinkle. Put it next to a basket with a leather or wood handle for the shelf, something with a bit more structure, so the whole lineup doesn't go soft all at once.