Must-have if you have an inflatable sleeping pad - Exped Schnozzel PumpBag

If you have a compatible inflatable sleeping pad, this is a must-have piece of gear. You were already going to pack your bulky sleep system in something waterproof, so this doesn't add any net weight to your pack. It's actually probably lighter than whatever you're already using (it's lighter than any other option I've found with a similar volume). It's actually such a good dry bag for sleeping bags that I bought one for my daughter, even though she prefers a foam sleeping pad. And while you sleep, throw all of your dry hiking gear (puffy jacket, etc.) inside the bag so that if you get moisture inside your tent, at least that gear won't get wet.

This is the best way to inflate an inflatable sleeping pad, period. After having to deal with some of the other options, we only buy inflatable sleeping pads that are compatible with this pump bag (we've used compatible pads from REI, Sea to Summit, and Exped). We've dealt with too many other "pump bags" that are slow, heavy, and inefficient. This thing fills inflatable pads in 2-3 squeezes, and is easy to do even after a long day of hiking. It doesn't leave you light-headed, and it doesn't move moisture (from your breath) into the inside of your sleeping pad.

If you're looking at this wondering whether to get it: get it!