If you decide to go with a sporran you might consider something that is more flexible. Perhaps you can find a inexpensive one which doesn't get in the way with physical activity such as bending to pick something off the ground. I spent a little more to get a casual style which is softer and bends somewhat with my body. Easier on me and the material of the apron. Also, leather belts instead of the metal will help to save your kilt. (thanks Hamish)