Similarly, to remind myself to do stuff with an object, I put that object where I will find it when I prepare to go out.

If my hamper is full, but am going to bed or leaving for work, I just put the hamper in front of my door so I will remember to do it immediately when I get home.

I also put stuff I need to take with me next time I leave the house on top of my wallet (or my shoes, or hanging from my doorknob, depending on size).