Want to have a super fast cobra bag that never deflates? Check out these instructions that include making the top section of the cobra bag using a 3/4 inch PVC pipe and pool noodles!
Save a ton of money by making your own fast and powerful cobra bag using the Kewlus Cobra Bag Spring: the KS2. This spring is designed to fit perfectly onto a standard 3/4 inch plumbing pipe that you can buy cheaply from a hardware store - view full details for DIY intructions.