Regardless of which format cameras you use, space will be an issue. You'll need to be very selective about what gear you choose to bring. Several years before returning to riding I switched over to µ4/3 gear which makes packing space much less of an issue. If you're going to be doing much off road riding, your gear needs to be protected against shock, vibration, moisture and dust. Pro grade gear will hold up best, but then you're dealing with even bigger and heavier gear.