I just bought a DSLR for my upcoming trip in November. I am not sure which type of bag to buy to carry it around it the parks. I will also be carrying around a little point and shoot, my refillable mugs and a bunch of other stuff. Does anyone recommend a type of bag that will fit a lot and keep my camera safe, but also easy to pull out ASAP? Is it a real pain to even bring a backpack? Should I just stick with a little bag and a camera bag? Ahhh decisions decisions....