1 month around Eastern Europe. So I am going to take with me:

Pack of cards
Waterproof mac
Sleeping bag
Warm top
5 tshirts
1 jeans
2 shorts
1 swimming trunks
Mobile phone + cable to connect to computer
ipod + ipod charger + headphones – (with some movies on there)
Towel
Any tickets (rail etc)
Adaptor plug
1 book (Bob Marley Autobiography)
YHA card, European Health Card
Lock

All of which is to fit in a 35 litre bag!