[Dollarama] Stayhold Gray Sidekick Cargo Grips Carpets and Rubber Liners | Car Trunk Organizer | for Auto, SUV, Minivan & Boats
Amazon Reference Link . $22 USD
These works great. I was driving around with a box full with bottle water and it stayed in place.
It's like a book end where the box's weight put additional force on the tiny spikes which grips into the carpet.
Found a handful of them at the hardware tools sections in Tsawwassen and No 1 Road, Richmond location. I bought them all for my 3 cars.
I couldn't find them at Lansdowne Mall, Granville St / Marine and Bridgeport Road.