Is there anything more frustrating than getting ten minutes away from home only to realise you forgot something important and have to double-back? It only takes one forgotten laptop or smartphone to make these £5.50 door hanger sticky notes completely worth it as a last-minute fail-safe reminder.
Assuming at some point you remember what you need to leave the house with, you can leave your future self a handy reminder in a spot where they're guaranteed to see it on the way out, without the risk of the note losing its stickiness and falling to the floor. Now if only there were some reliable way to remind yourself to order a few stacks of these. [DOIY Design via holycool]