This Instructable is so very easy, all the supplies/tools you need are:
1 - 3" PVC Cap
1 - 3'ft PVC (thin wall) piece of pipe
Drill (drill bits to match bolt sizes)
The rest are items found around home, such as the strap from a duffle/shoulder type bag, and I chose to use some camo Duct tape and wrap around the pipe.
1 - Strap
1 - Duct tape (if you choose)