Rab Neutrino Endurance 400 25

Field Notes: After a stuff sack mix-up, our tester believed he brought a 20-degree bag on a 3-day backpacking trip where temps dropped below freezing under the rim of the canyon. This 25-degree Rab ended up in his pack and, even as temperatures hovered near the EN Lower Limit, he remained snug in the Neutrino 400. Combine it with a puffy and long johns to go low, it was the team’s favorite ultralight sleeping bag. 

Pros: Rab is entrenched in the gritty minimalism of modern alpinism. Even if you’re simply a casual backpacker, such a carefully-designed product makes a significant, positive difference. This nearly weightless bag stuffs down small, perhaps equal to the Brooks-Range Drift 20 for smallest. The comfortable hood was easy to cinch even as gusts of wind pounded the Pertex Endurance outer fabric. Pertex Quantum lines the body of the bag with both fabrics treated with DWR to ensure the Nikwax-protected hydrophobic down doesn’t come face-to-feather with moisture. 

Cons: Our single concern was a few renegade down clusters sneaking through the central, inner seam of the bag. Will leakage be a problem over time? Rab has a solid guarantee that covers the original owner to inspire confidence in resolving any concern with their customer service team.  

Favorite Feature: The Pertex Endurance fabric makes for a reliable exterior. It’s durable with no snags or tears even after being tossed over thorny brush and used as a quilt over rough sandstone by our inquisitive testing staff.

Tester Comment: “I’m a big fan of Rab in the mountains—now I’m a big fan of Rab in the desert, too. Frosty nights and cold mornings were nothing to the Endurance Neutrino 400, and I loved the hood when it was windy.”

Bottom Line: If you already have a 0-degree sleeping bag up to a 15-degree bag and/or are looking for a lightweight 3-season bag that will do well in summer, look at this Rab sleeping bag. It’s a top tier bag that everyone from alpinists to fast and light backpackers will appreciate