To make a trash can or box from used jerry cans, you can follow these steps:

1. Preparation of Materials and Tools: Prepare two clean used jerry cans, scissors or a knife, sandpaper, and rivets or bolts to join the parts. Make sure the jerry cans are completely clean from any remaining previous materials.

2. Cutting the Jerry Can: Cut the top of one of the jerry cans to use as a lid and the bottom of the other jerry can to use as a container. You can also cut the sides of the other jerry can to strengthen the structure of the trash box.

3. Smoothing: Use sandpaper to smooth the cut edges so that they are not sharp and safe to use.

Installation: Join the bottom and top of the jerry can using rivets or bolts. Make sure all parts are attached tightly so that the trash box does not collapse easily.

4. Finishing: After all parts are installed, you can paint or decorate the trash box according to your taste to add to its visual appeal.

By following these steps, you can turn used jerry cans into useful and environmentally friendly trash cans or boxes.