If you routinely camp or have outdoor picnics, you might find it useful to have a garbage bag holder that can be stored away when not in use. Build your own with PVC pipe, joints and wood for the lid.
PVC project weblog PVC Plans shares a simple garbage bag holder project. The exact dimensions will depend on what thickness of PVC pipe you use, but the basic structure will be the same -- two squares that each have T-connectors for the two posts that hold up the top of the holder. You'll then make a top out of any material heavy enough to not blow away in the wind. Finally you can spray paint the entire setup if you like.
This would be a great addition for the party box we covered last month.
PVC Trashbag Holder [PVC Plans]