Here’s what I carry around after one year of travels through USA and Central America.
I have to admit that I’ve made a good decision with the backpack, and even if the brand is not appealing to you, I’d advice you to buy a backpack that opens the same way, and weights as little as possible. If you’re not planning a trip longer than a couple of weeks and already have another backpack, just use the one you have – it’s cheaper, and cheap makes the trip longer!