BMW makes a cargo mat specifically for the i3, with a non-slip/textured rubberized surface that fits the cargo area (rear seats up) perfectly. It also folds up into a cargo box to help keep groceries, etc. from sliding around. Though we solved the sliding/falling over grocery bag issue with folding grocery carriers we just take into the grocery store with us- and work great. Easy for the baggers to pack, and no more squashed bread/produce, etc. and no more cans rolling around, or bottles falling over/spilling (had a milk carton fall over and leak in a previous car - made a huge mess).
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE