The Recycled Film Canister Magnets. Built-in hidden magnets will stick to your fridge and keep your pictures (in the case for those of us still value having pictures printed) and memos where they ought to be – on the fridge. 35mm film canisters are becoming a relic of yesteryear’s. Soon you may not even seen them on the market and your kids will wonder what they are (not to mention how to even load or develop them – darkroom anyone?). Thankfully, while they are still around in recycled canister form, you can buy a couple and use them as magnets.