Looking for the perfect handbag for travelling

I am on a mission. A mission to fulfill a need to find the perfect travelling handbag. I want it to be the bag that I can take with me to Colombia this summer. I would like it to be large enough to hold magazines, books, my camera, Ipod, blackberry, cell phone, make up bag, not to mention the 2 litres of water that I buy whenever I fly. It also has to serve another purpose, to be my handbag while in Colombia, so it needs to zip or close on top. I looked at the Gucci website, nothing really great (there is one, but I am not sure), Louis Vuitton, nothing, Chanel, nothing that I can afford, Bottega, saw a couple but again the price tag is insanity on the ones that I like..... I think that this is going to be harder than I thought. I am sure that I will end up with the Gucci. Its cute. I'll buy it in black and be done with the whole thing. I am really hoping for something else though. Any suggestions anyone???? There must be a bag out there for me. I don't care if it is cheap or expensive, or from a brand that I don't know, I just need one, and a nice one.