Polycarbonate vs ABS vs aluminum luggage

For most travelers, polycarbonate is the hardside material to buy: it flexes under impact and springs back, resists cracking, and is light for its strength. ABS is cheaper but more brittle and heavier for the same strength — fine for occasional use, not for frequent flying. Aluminum is nearly indestructible, beautiful and expensive, but heavy and it dents rather than flexes. The differences are real and worth understanding before you spend.

The three materials at a glance

Polycarbonate: the sweet spot

Polycarbonate is a tough, flexible plastic used in everything from riot shields to eyeglass lenses. In luggage it is the material to want because it absorbs an impact by flexing and returning to shape rather than shattering — exactly what you need when a bag is thrown onto a conveyor. It is also light for its strength and holds a premium finish. Most bags we recommend in the hardside roundup are polycarbonate for this reason.

ABS: cheap, and it shows

ABS is the plastic most bargain hardsides are molded from. It is inexpensive and light, but it is more brittle — under a hard enough impact, especially in cold weather, it can crack rather than flex. That is fine for a bag you fly twice a year and not fine for one you check every month. Many budget bags use a polycarbonate/ABS blend that splits the difference. If a hardside is suspiciously cheap, it is almost certainly ABS.

Aluminum: the luxury outlier

Aluminum cases (think Rimowa) are gorgeous, nearly indestructible, and a genuine status object. The trade-offs are real: they are heavy, they are expensive, and instead of flexing they dent — which some owners consider character and others consider damage. Unless you specifically want an aluminum case and its patina, a good polycarbonate bag gives you most of the durability at a fraction of the weight and price.

What to actually buy