I'm not sure, it was easy enough to carry by just myself, so the fiberglass weight wasn't significant.

According to this chart: http://www.boatdesign.net/forums/attachments/fiberglass-comp...

The fiberglass weight would be under 3lbs.

For the plywood - 3 pounds per square foot per inch of thickness according to APA Plywood Design Specification so

= .25 thickness * 8 width * 4 height * 3 lbs

= 32/4 * 3

= 8 * 3

= 24lbs plywood weight

So I'd say the boat was between 25-30lbs and that feels about right.

That's quite light, considering my cannondale mtn bike is ~25-30 lbs.

Still, I'd love to see what additions such as AeroGel powders and carbon nanotube fibers would do to the weight of a rigid boat such as a canoe.

I think another design challenge would be a fold-able plastic one ala camping flatware (http://www.orikaso.com/)