Step 1: What you will need
1. A box shaped as a cube...
2. A pair of scissors.
3. A knife.
4. A plastic bag.
5. A screwhook
6. 2 small cylindrical pieces of wood ( you can just cut a pencil in half ).
7. Duct tape
8. A couple of screw nuts
9. A heavy duty rubber band
10.A drafting compass
Step 3: Fire in the hole!
Take a ruller and find the center of the box top
Then get your compass and make a circle. Then cut it out.
After you cut it out i recommend puting some duct tape where it was cut.
Step 4: Attaching the bag
Then you must push it a bit inside , but not to much you want to have some plastic bag on the outside so you can stick it on the box.
Now you take your duct tape and you tape the bag on the sides of the box. It must be airtight.
If you have to you can also trim some of the bag.
Step 5: Putting the hook
Now take the screwhook with a screw nut on it and put through the hole on the bag.
Then attach another screw nut on the screwhook so it won't come off. You also put a screw nut in the end of the screwhook, but that is optional.