More on this. While it is tempting as hell to take your iPhone into the Amazon for all those photos, PLEASE keep in mind that the typical downpour virtually guarantees you a ruined phone. This is serious. First, you can get clear plastic cases which allow you to operate them. Second, if something goes overboard, and Murphy's Law says it will, you can save your gear. Third, you might seriously consider putting your stuff into packing cubes and then inside waterproof bags. While this will add weight, imaging your joy joy joy when you and your gear get caught in a massive downpour and not a single thing gets wet. I've been doing this for years, and what I use are Sea to Summit dry bags. YES they add a touch of weight. But if your down jacket is soaked? Well. I can't back this up enough.