One manufacturer used bullet proof vest fabric in its base fabric. They make some rafts of 35 ounce PVC coated polyester fabric. You can easily carry and repair these rafts. PVC overlay is less susceptible to rips and tears. The air compartments are hot air bonded for strength and efficiency.
Some rafts have baffle cones within the tube that expands if there is a loss of air.
Some two person raft weighs from 13 to 17 pounds and rolls up to the size of a sleeping bag. Raft makers strongly propose you buy your first raft from a manufacturer having a good reputation. A raft is only as good as its frame. Load, people, oar location, and the water you intend to float have an impact on designs. Tube diameter often depends on what stretch you wish to run, and the amount of gear that you need to take.