Marmot is a great choice, across the board. I have a +15 Pinnacle, a +15 Helium, a -20 ???, and my newest, an Arete. http://www.campmor.com/marmot-arete-...4&ci_sku=46589 This bag packs down to absolutely nothing, yet the 800 fill down makes for a warm bag for summer use. When you add in the fact I always have a polartec, etc. jacket with me, I can use this down into the thirties and be alright. Great summer bag. Not the cheapest, but once I've bought it I never think about hte price again. Stuffed, my Arete weights 1lb, 7 ounces. Combine it with a T-rest Neoair mattress (14oz) and you have an amazing 2lb, 5oz sleep system.