I know this has been discussed in here before, but my question is a little different. As far as I read the literature, a spare battery must be carried in a carry on with you on the plane and sealed in a plastic bag. But, when you travel, do you use a softpack bag or hardcase for carrying your camera? I'd prefer my hard case just for the sake of protecting the camera, but don't know how it'd be viewed by security at the airport. Anyone run into any problems using a hard case?