I bought an Office Depot Poly Ultra Wallet a while ago because I wanted a portable inbox – it only costs three bucks. Basically, it’s an inexpensive (cheap) solution when you’re out and want to keep whatever stuff you gather throughout the day. Then when you get home, you can dump everything into your main inbox. Additionally, you could keep a small pad of stickies to “tag” the items for easier processing later on.
It definitely looks nice because they come in assortment of colors – I have a blue one! 🙂