I used to say that all my best days started with waking up in a sleeping bag. Waking up in a sleeping bag usually means you're out there somewhere, doing something interesting. In the past couple of years, though, I've found myself waking up out there to wonderful days spent doing interesting things, but without a sleeping bag in sight. Instead, I'm sleeping in what thru-hikers and ultralight redditors call a quilt. This is not a quilt like the one your grandmother gave you. Backpacking quilts are made of nylon and filled with down like a traditional sleeping bag . The difference is that they lay over you like, well, a quilt, rather than wrapping all the way around you like a sleeping bag. The benefit is twofold: A quilt is lighter, meaning less weight to carry in your pack, and, as an added bonus, I sleep better than I ever have in the backcountry.…