For me, it depends on what I need with me. Usually when I go to DL I just carry my regular purse--it's large and I can fit a water bottle and sunscreen in it just fine. I wear it across my body so it's a little easier to carry. I generally tie a sweatshirt around my waist (at DL we need them in the evenings, even during the summer) When I took my neice and nephew to DL, I used a backpack because I needed extra clothes for them plus more space for water bottles. When I went to WDW I carried a backpack. I didn't know what I needed there (I didn't know that in late April one did not need a sweatshirt in the evenings), but even when I realized that extra clothes weren't really neccessary, I still used the backpack because I bought 1.5 liter water bottles at the resort store most mornings (at $3.50 you get a whole lot more water for the money than the 24oz bottles at $2.50--and I don't mind it not being cold), plus carried a Pal Mickey (who went in the backpack for thrill and wet rides).
Its designed by a Flight Attendant, and you can carry your Cell Phone, Pen, Credit cards, Tickets, and Maps.
You can wear it 3-4 different ways, as a fanny pack, on your belt, or across the front of you.
however the inside of my bag is padded and has a little fold out divider thing so you can put a smaller camera in it . I have a larger canon rebel slr which fits with room to spare with the divided folded flat against the side. i take a ziploc bag to put the camera in inside the bag for wet rides, for normal rain and stuff, even splash mountain, I haven't needed to, everything has stayed dry, I think cause of the flap that covers all the inner zippers( goes over the entire top and down the entire front and velcros) rapids ride i haven't taken it on yet so i would be safe & put the camera and film and paper money ect, in a baggie till i am sure it will stay dry.
