Your camera bag should be comfortable to carry around, especially for travelling. That means it should fit under an airplane seat as a personal item, instead of having to check it. Waterproof backpacks are a great alternative as they are built for any weather condition. You'll also need a bunch of compartments to carry your camera, lenses, accessories and even a tripod. You can easily find all of these and more at Abes of Maine, your trusted partner in buying electronics.