When i had a flat tire i didn't want to just waste that old tube so i decided to wrap it around my chain.
What you need:
1.A length of chain, each link is 2cm wide by 3cm long (size for 700c tube)
2. Old 700c tube
3. Shoe lace or any strong thin string/rope
5. old button up shirt that you don't mind getting dirty
First, tie the shoe lace onto the end link, you will use this to pull the chain through the tube. Cut the valve of so you end up with a tube with two open ends then feed the shoe lace through the tube and tie it to something strong. I used a window fixture in my flat, worked fine and was a good height at about stomach level.