Montbell's Seamless Down Hugger 800 sleeping bags combine 800-fill-power EX down with lightweight ripstop to provide warmth without the weight. As you can probably see from that list of features below, a lot of thought has gone into this-with that baffle-less construction retaining heat, while that patented Super Spiral Stretch System keeps things comfy while cutting down on excess space, boosting the thermal efficiency.

The #5 is designed as a two-season bag, recommended for temperatures going down to 3°C.