It is just a bit too big to fit into the separated compartment of my backpack, but it’s easy enough to remove the divider and have one big space in my pack. Our extensive testing process and thorough assessments aim to crack the code for three-season backpacking sleeping bags. Two sleeping bags with the same fill weight and fill power might not provide identical warmth, but they should be pretty close. With DWR coating on the interior and exterior and synthetic insulation this bag is quite water resistant. If you select similarly heavy gear for your entire overnight kit, the weight difference will quickly grow to double-digit pounds.

Our testers found the 15-degree rating to be consistent with similar bags lower limit EN ratings, but it will lose most of its insulative power if it gets wet, just like any other down bag. They unzip to let warm air out if you get too hot at night, allowing you to vent body heat without letting cold drafts in, and they work well, especially in changeable conditions. While it has some of the most space around the shoulders and torso, the standard tapered mummy shape and narrow footbox won't be appreciated by everyone. Bear in mind that we are all individuals, so we all feel the cold differently and that our own resistance will fluctuate depending on a whole load of factors, including how much we have eaten, whether we have consumed alcohol, whether we need a wee or what kind of mood we are in! But if misalignment occurs in the backcountry with the Sea to Summit Spark II, The North Face Cat's Meow, or Therm-a-Rest Hyperion, it could be impossible to restart the zipper or close the bag properly.In the heat-retention test that I conducted on all 13 sleeping bags, the Forte was one of the top performers, so once it’s warmed up, it stays warm.

Forte’s classic Spoon™ shape provides a generous cut at the elbows and knees so side sleepers can shift positions comfortably throughout the night. A lightweight, lofty and resilient Primaloft RISE insulation is made from 100% post-consumer recycled content for an eco-friendly design that keeps you warm during cold nights. However, the EN 13537 European Standard does not apply to down-filled sleeping bags with a fill weight of more than 800g; for those bags, you will have to rely on the manufacturer's experience and technical expertise, which is often more accurate!

I also think the draft tube is too soft, which allows the zipper to get stuck about half the time you’re zipping up.