...and Dan knows these things...
When you look at his avatar you might think he's just another one of us strange Yanks in a silly outfit but, Nope, it's his specially designed rodent and flea-bite-proof suit. So, with one of those (Union Jack colors are always optional) and a big enough roll of duct tape, you'll not only be perfectly safe at all times, you won't need to carry a sleeping bag, and you'll lose 12 kilos of water weight before you even get to Nevada Falls.

Or, you can be like me, hike exclusively in your underwear, add 3 days to every trip you take in order to pet as much vermin as possible, go back to England, and it'll be just like 1347 all over again.