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
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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.
Put a little oil on a paper towel and rub it on the chain, be careful not to get it on your hand or it will be really hard to pull the tube up the chain.
This is were the button up shirt comes in. button it up and put the chain through the shirt at around about stomach level so the chain is level.
Now you can pull the tube up over the chain.
Once you have pulled the tube right up to the top your done, YAY,
If you have some excess tube left over you can even stretch it over your padlock.