I have the Case Logic Medium Nylon Bag with EVA Protection, as it easily carries my Nikon D7000 with a lens fitted (such as my Tokina 11-16mm) and another 2 lenses stored in the side pockets. It is great for light walking or if in the welsh mountains I carry a rucksack (with sandwiches, filters, etc) and the camera bag sits around my front, so I can quickly pull it out if needed. The base is rigid for it to stand on its own and is a life saver when I leave it on a wet beach with the tide going out. Also comes with a neoprene liner for the camera if you want to leave the camera dangling out. Costs £30 too.
thats a great day out at the zoo bag (and other uses)
i may get that as well as an ask for xmas