Having discovered that you can "get pretty with me" (see sleeping mat thread), I think there must be potential for camp(ing) cosmetics. Beauty products which are light, durable and easy to apply, in packaging that is lightweight, compact, spill-proof and unbreakable. Ideally the products would be multipurpose, protecting against sun, wind and insects as well as getting you pretty. They should be easy to apply without a mirror, although the there's scope for a compact (is that he term?) where the mirror also functions as a signalling and fire-starting device. Glass bottles are obviously right out as far as packaging goes.
Perhaps I'll launch a range and sell it via this forum, as well as maybe setting up a stall at, say, York Rally. Or perhaps such things already exist. Perhaps, in fact, these are properties of normal, existing cosmetics. Or perhaps all campers and hikers are beauty au naturel. And perhaps if I did this, I'd have to wear it myself – this probably wouldn't be a good advertisement (though who knows?).