Nylon (polyamide)

Also: polyamide, nylon fabric

Nylon is the base fabric of almost all packrafts. It provides tear strength, the coating provides airtightness.

The Packrafting Store explains why a packraft tolerates contact with rocks: the inflatable gives way, the polyurethane coating is scratch-resistant, and the fabric, unlike a film, has high tear strength. The thickness of the fabric is given in denier.