The flying environment is particularly challenging. You can leave from a local airport here and in about five minutes be either in mountains about 8000 feet high or over an ocean; throw in seasonal variations and you need to consider preparation for a variety of environments and conditions. When I am traveling by foot or bicycle, the range is much more limited I almost always carry plenty of water (more than I think I will need), at least a light windshell (Patagonia Houdini), some sort of FAK, a map and mirrored compass (unless I know the terrain very well), a blade, and fire making kit. If the country is rough, or has the potential of being rough, I will often toss in a minimum of 30M of thin climbing rope. I usually have some edibles squirreled away; going hungry is such a drag!