Big Agnes is one of the premier gear manufacturers in the backpacking community. However, if you’ve never seen a Big Agnes sleeping bag, you may be in for a big surprise.
Big Agnes was the first mainstream sleeping bag manufacturer to stop putting insulation into the bottom half of their sleeping bags. This can be a shocker if you’re not expecting it, but the reasoning behind this practice is quite sound: when you lie in a normal down or synthetic sleeping bag, the weight of your body compresses all of the insulation beneath you, effectively eliminating its heat trapping potential.
Recognizing this, Big Agnes shifted its focus away from just selling traditional sleeping bags to assembling complete sleep systems that combine a quilt like sleeping bag with an insulated sleeping pad like the Primaloft-filed Big Agnes Aircore, which I’ve reviewed previously on Sectionhiker.
With that background, we’re now ready to review the merits of the Big Agnes Lost Ranger 15 F which is a 3 season bag, weighing 2 lbs. 10 oz. Filled with 650 fill goose down, the Lost Ranger is much wider than most mummy style sleeping bags. With a shoulder girth of 70 in and a hip girth of 66 in, it has a semi-rectangular shape, making it good for larger people or people who like a little more space at night.
Like all Big Agnes pads, the Lost Ranger has an outer sleeve, shown below, that you slide an inflated or rigid sleeping pad into for insulation from the ground. The Ranger also has an additional pillow pocket inside the bag and at the base of the mummy hood that is convenient for holding a pillow such as the Big Agnes Primaloft-filled Air Core Pillow, which is designed for semi-rectangular bags.
The Lost Ranger also comes with a draft collar that cinches around the top of your chest and prevents warm air from leaking when you move around at night. In addition, extra fabric around the zippers prevents snagging.
I’m told that the Lost Ranger is one of Big Agnes’ all time bestsellers and it’s obvious why.
Disclosure: The author owns this product and purchased it using their own funds.
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