I have a wooden walmart net that is probably the same one you mentioned. I went and checked it out, and realized its not nearly as heavy as I remembered it being, alot of the weight I was thinking of was from the bolt snap I have on it to attach it to the back of my fishing vest (I wont be taking the vest hiking, I've made a small pouch for that).

Dad has a metal net the same size as the wood one, and it's MUCH lighter than my wooden one. The carbon fiber mentioned reminded me I have some old aluminum arrows in the basement. I had an idea to make a net out of two of them, and part of a third, but the three arrows felt heavier than the net I was comparing to. I think I'll probably just take that net and be done with it. I dont have any scales, but if the wooden one weighs 4.5 I'd say that one isn't much more than 3 judging by feel.