Visit a local sporting goods store and purchase an appropriate-sized gun box or plastic toolbox. One of the simplest ways to build a scooter trunk is to mount a pre-built ammo canister onto the rear rack. These cans are solidly constructed, waterproof and secure.
Use a drill to make several small holes in the bottom of the box or canister then secure it to the rear rack of the scooter seat with machine bolts and wing nuts.
Load the trunk up to the maximum weight allowable on the rack, minus the weight of the canister or box (normally around 20 pounds). This type of trunk is easy to build and quick to install; however, it is not waterproof unless you seal around the edges with silicone and rubberize the bottom of the trunk with water sealant.
