It's not as hard as it sounds to pack everything you need for a month-long trip into a single backpack. Here is more or less everything I'm bringing with me:
1. Money Belt - contains credit cards, passports, cash, etc.
2. Clothing - two pair pants, three shirts, belt, two pair underwear
3. US cash for bus fare
4. Toiletries bag (medicine, toothbrush, etc)
5. Glasses and accessories
6. Netbook (Asus EEE PC 900HA, power cord, thumb drive)
7. USB mouse, hub
8. Power adapters for Britain and Europe
9. Keys, including keychain compass
10. Cellphone/PDA
11. MP3 player
12. Poncho
13. Travel towel
14. Reading material (small book size but dense material, good longevity for the space)
15. Flipflops for showers
16. Walking shoes
17. Two pair socks
Since one change of clothing can be stored conveniently on the body, the remainder can easily be stored inside a single backpack, with room for purchases and miscellany.
