sheet metal boats
They have the additional advantage that, when damaged, they seldom paddle much worse than when new, although they start at a pretty low standard.
Unless
Perhaps OP is one of the few of us that is getting stronger with age. Most of us, after a plateau in the mid twenties, start heading in the other direction, which is where Kevlar or better yet, a carbon/Kevlar combination comes into play. Stiffer, lighter, stronger, ie better performance on water, easier to carry, less likely to be damaged.
Been said before,
you can have light, you can have strong and you can have cheap. But, you cannot have all three - you gotta pick two.
Peter