I want to make my own tarp system. The 1.9 oz ripstop tarps are great to save weight and bulk but they're so so so weak. I hate having camping gear made from this material. It just plain doesn't last. I have a tent made from 2.9 oz ripstop nylon and it didn't make it three months without tearing out. I just don't want the stuff anymore. I've been looking about good old fashioned "break your back" canvas pup tents, but I'd really rather have a tarp system. I've looked about making a canvas tarp, but it seems that the 400D and 500D nylon Cordura fabrics are much stronger, waterproof, weigh less, and has less bulk than canvas. So does anyone have an opinion on the 400D and 500D nylon Cordura canvas? Are they too stiff for the tarp setup? What are the real weights of these nylon materials? It seems that every site has a different number of ounces per yard. I've seen 5 oz to 10 oz. That's a big difference. I have a Molle II large field pack and it's made of 1000D Cordura. It seems like a great material, but the tarp may push up to seven or eight pounds. The other two should keep me in the four to six pound range, which is fine. Thanks for any help you can give!!