Much like with skis, snowboards, and 5-in-1 shampoo & body wash combos, you technically can have one sleeping bag to serve all of your purposes, but it can be a jack of all trades or master of none situation. The Marmot Micron 50 Sleeping Bag is the warm weather bag in your camping and backpacking quiver. This ain't for blizzards, but it carries way better than any of your heavy duty 20 degree bags could dream of and is a great companion in typical July and August weather. This thing is lightweight, low volume, and super comfortable for the glory days of summer.