BMW i3 Specific Rear Bumper GuardRear Guards in the UK has a custom molded, rigid, plastic bumper guard that protects the top surface of the bumper and also goes over the edge and slightly down to protect the edge.
Generic Rear Bumper Guard41 inch generic rubber sill bumper protector from Amazon is said to fit the i3 perfectly
Homemade DIY Rear Bumper GuardSome i3 owners build their own canvas and felt version that folds out of the trunk and over the bumper for when you load and unload cargo.
I ended up buying a piece of felt big enough to fold it with four layers, then sewed the canvas on top along with a couple of tabs to tie to the cargo loops. Cost me about $10 in materials and maybe 1/2-hour labor…I just couldn’t see spending that much money for BMW’s. jadnashuanh, BMW i3 Forum Member