A suitcase goes chaotic on day two, not day one. You pack it neatly at home, pull out one shirt in the hotel room, and by the third morning you are digging through a flattened heap looking for socks. Packing cubes fix that by turning one big cavity into several small ones, so the thing you need stays where you left it and the rest of the case stays undisturbed.
They also make you honest about volume. A cube either closes or it does not, which settles the argument about the fourth pair of shoes before you reach the airport.
Most sets in this luggage organizer set category cover the same job, so the decision comes down to how many pieces you get and whether the shells breathe.

These cover carry-on weekends through to a fortnight in a checked bag. All of them sit in the wider travel organizer bags range.
The most complete option here, with separate compartments sized for clothes, pants, shoes and socks rather than seven identical squares. That split is the useful part, because shoes never belong in the same pouch as a clean shirt. Good for a long trip where you want a fixed place for everything.
Also seven pieces, but weighted differently, with dedicated clothing bags, underwear pouches and shoe pouches. Built for business trips where you unpack into a hotel wardrobe and want the small items to stay contained rather than loose in a drawer.
Lightweight, foldable and machine washable, which matters more than it sounds after a trip where something leaked. They collapse flat when empty, so they take almost nothing out of the case on the way home.
The same six-piece idea in a tougher oxford shell. Oxford holds its shape when the cube is only half full, so the stack in your case does not slump the moment you remove one item. A sensible default if you travel often.
The one to pick if you routinely sit on your suitcase to close it. The extra zip pushes the air out of sweaters and jackets, which is where the volume actually hides. Worth noting it does nothing for weight, only bulk.
Larger pieces throughout, aimed at checked luggage and family packing rather than a cabin bag. If you are packing for two people in one case, the extra capacity per cube saves you juggling twice as many pouches.
Pack by category, not by day. Outfit-per-cube sounds tidy and falls apart the first time the weather changes; one cube for tops, one for bottoms, one for underwear survives contact with a real trip.
Leave one cube empty on the way out. It becomes the laundry bag, which keeps worn clothes away from clean ones without a separate sack rattling around the case.
And pack the heavy cube nearest the wheels. A case stands up properly when the weight sits low, and nothing inside shifts when you tip it onto its back.
Six or seven mixed sizes will serve almost everyone; go compression only if you genuinely overpack, and oxford if you travel enough to care about the shells holding their shape. A decent packing cube set turns the third morning of a trip back into something you can manage before coffee, which is the whole point of buying one.
All six sets are listed on Temu, and you can pick up whichever size split matches the way you pack through the travel organizer range.
OrganizeTrip publishes packing and luggage writing through the year, worth a look before your next trip.