PU is on the spec sheet of most bags under a hundred dollars, including ours. It is worth understanding what it is, because the marketing names around it are deliberately confusing.
What it is
PU stands for polyurethane. A PU bag is a fabric backing, usually polyester or cotton, coated with a layer of polyurethane and then embossed with a grain pattern so the surface reads as leather.
It is a plastic coating on cloth. That is not an insult, it is just the description.
The names it hides behind
"Vegan leather" means PU or PVC in almost every case. "Faux leather", "leatherette" and "man-made leather" mean the same thing.
Watch for "genuine leather" as well, which sounds like the top grade and is actually near the bottom of the real-leather grades. And watch for "leather-look", which is PU wearing a longer name.
None of this makes PU bad. It makes the label unreliable, so read the material line rather than the adjective.
What PU is good at
It is light. A PU bag with hardware can come in around 275 grams empty, where the same bag in real leather would be noticeably heavier on a thin strap all night.
It is consistent. No grain variation, no natural marks, which is what you want when a bag is cream or powder blue and you care about it matching the photos.
It handles rain far better than untreated leather. Water sits on the surface and wipes off instead of soaking in and staining.
And it holds color. Pastels and brights that would be difficult and expensive on real leather are straightforward on PU.
What PU is bad at
It does not age, it degrades. Real leather develops a patina. PU does not improve, it just eventually cracks.
The failure mode is delamination: the coating separates from the fabric backing and flakes, usually at fold lines and corners. Heat and prolonged UV speed this up considerably, which is why a bag left on a car dashboard ages years in a summer.
It does not breathe, so anything damp sealed inside stays damp.
And it cannot really be repaired. A scuff on real leather takes conditioner. A scuff through a PU coating exposes the backing and there is no fixing that invisibly.
How long it lasts, honestly
A PU bag used a few times a month and stored properly holds up for years. The same bag used daily and stuffed full will show wear at the corners and strap points within a year or two.
That is the real difference between PU and leather: not how it looks new, but how many hours of use it survives. For a going-out bag worn a couple of times a month, PU is a completely reasonable material and the weight saving is a genuine benefit.
Taking care of it
Wipe with a damp cloth and dry immediately. That is most of the job.
Skip leather conditioner. It is formulated to feed a natural material and it does nothing for a plastic coating except leave a film that attracts dust.
Store away from heat and out of direct sun. A closet shelf is fine. A car, a radiator, or a sunny window is where PU dies.
Store it lightly stuffed and flat rather than folded or hung by the strap. Fold lines in PU turn into crack lines, and that is the most common way one of these bags is ruined by storage rather than by wear.
What to check before buying
Look at the edges. Cut PU edges are usually painted, and thick even edge paint is a sign of a more careful build than a thin patchy line.
Look at the lining. A polyester lining sewn in cleanly is a good sign. Glued lining is not.
Look at the strap attachment points, which is where a light bag actually fails first. Metal hardware anchored through reinforced material lasts. Hardware attached to a single unreinforced layer does not.
Our quilted crossbody is PU with a polyester lining and a detachable strap, and we say so on the page rather than calling it vegan leather and hoping you do not ask.
The short version
PU is a plastic coating on fabric. It is light, colorfast and water-resistant, it does not age gracefully, and it lasts a long time in a bag you wear occasionally. For an evening bag that is a fair trade. For a bag you will carry every day for five years, buy leather and expect to pay for it.