I am about to get a Canon Rebel SLR.. It will be my first SLR.. Next month, I will be traveling abroad and will be doing a lot of walking/hiking. I need to purchase a general backpack to carry it in along with other stuff that I may carry on a hike (maybe a water bottle, and ipod). It does not have to be very big. My main concern is a general backpack, I am not concerned with a bag that holds extra lenses or anything.. So does anyone have any recommendations? ** I should rephrase my question- Basically, what is the absolute smallest case that I could find for the canon rebel xs slr (stock lens) that would allow me to carry it in a regular backpack?