When it comes to finding a summer sleeping bag for your next backpacking trip, many trekkers look for the lightest option available. Summer is the best time to experience ultralight or minimalist backpacking at its finest. Summer sleeping bags are usually rated at 40 degrees or higher, and because of this, they have less insulation, which means the bags are lighter, smaller, and more compact. It is not uncommon to find a summer bag that is close to a pound in total weight, which means you are well on your way to packing less than 10 pounds of gear (usually the cutoff for ultralight backpacking). If you are looking for a summer sleeping bag to add to your equipment arsenal, this is the place for you to be. Below, we will highlight our favorite lightweight summer sleeping bags out there on the market today.
Mountain Hardwear Phantom 45 – $170
The Mountain Hardwear Phantom 45 is very high on our list of best summer sleeping bags. It is a lightweight 800-fill down sleeping bag that weighs only 1 pound 3 ounces. It is cut to snuggly fit your body to maximize warmth and minimize weight. Mountain Hardwear sleeping bags are known for their comfort, and the Phantom is no exception. The price is right, especially if you can find it on sale at Amazon (which at the time of this writing it currently is). Click the following link to purchase yours today!
Marmot Atom 40 – $290
Marmot is another name in the industry that has a devout following. The Marmot Atom 40 is one of their ultralight sleeping bag offerings for summer month backpacking, and is a 2008 Backpacker Magazine Editors’ Choice award winner. Coming in at 1 pound 5 ounces, this bag is super light, compacts down to the size of a Nalgene bottle, and will keep you warm below 40 degrees with a simple base layer. The Atom features 850+ fill power goose down, which is the best weight to warmth down on the market today. Click this link to order your Marmot Atom 40 today!
Marmot Atom 40
Marmot Always Summer – $200
Appropriately named, the Marmot Always Summer is a perfect summer sleeping bag for backpackers of all types. While not as light as the Marmot Atom or some of the other bags on this list (coming in at 2 pounds 3 ounces), the Always Summer makes up with its attractive price point of under $200. It features a slightly heavier 650-fill down, so it won’t be as compactable as higher-fill down sleeping bags, but the bag is rated down to 40 degrees. This is an all-around great summer sleeping bag, and offers great value at its price point. Get yours today by clicking on the following link!
MontBell UL Super Spiral Down Hugger – $320
This is a sleeping bag that I was personally excited to test myself. First of all, it comes in multiple temperature ranges, but the 40 degree bag is by far the lightest and most economical of them all. The Spiral Down Hugger features 800-fill power goose down that weighs an amazing 1 pound 2 ounces. That is truly ultralight. This sleeping bag also features a stretch woven fabric that allows the bag to conform to your body as you sleep. This stretch keeps the bag snug to your body but does not constrict your nightly movements. I loved this bag, for all of the reasons discussed above, and would recommend it to anyone seeking a truly ultralight summer sleeping bag for backpacking. To get your MontBell UL Super Spiral Down Hugger today, click the following link!
Big Agnes Pitchpine SL – $330
Another summer sleeping bag that gets really close to the one pound threshold is the Pitchpine SL by Big Agnes. Rated to 45 degrees and insulated with 800-fill power goose down, the Pitchpine SL offers a 1 pound 2 ounce package that compacts to a very small overall size (5”x6”). This is a comfortable bag that has a lot of comfort add-ons, like a pillow pocket, sleeping pad loops that allow flexibility in the legs, and a water repellant surface treatment to keep you dry and warm. The Pitchpine SL is a true ultralight summer sleeping bag that offers a lot of bang for your buck. Click on the following link to get yours today!
Lafuma Lightway 45 – $125
A more economical choice (around $125), the Lafuma Lightway 45 will still allow you to approach that ultralight backpacking concept. Weighing in at 1 pound 9 ounces, the Lightway features 600-fill power duck down which is more affordable than higher power goose down. This is a perfect summer sleeping bag option that has an attractive weight and price tag. To get your Lafuma Lightway 45 today, click the following link.
Lafuma Lightway 45
Kelty Cosmic Down 40 – $100
The most affordable sleeping bag on our list, the Kelty Cosmic down 40 sleeping bag comes in right around $100. It features 550-fill power down, which adds a little to the overall weight of 1 pound 13 ounces. It also includes hang loops for storage, sleeping pad security loops, internal liner loops for those cooler summer nights, and a form fitting and snug shape. If you are looking for the best bang for your buck, the Kelty Cosmic down 40 sleeping bag is for you. Click the following link to order yours today!
Kelty Cosmic Down 40
Exped Ultralight 300 45 – $350
The 1 pound 4 ounce Exped Ultralight 300 lives up to its name as one of the best summer lightweight sleeping bags on the market today. Featuring a high loft 840-fill goose down insulation and a waterproof packsack and net storage bag, the Exped Ultralight 300 is a great choice for ultralight backpackers. To order your Ultralight today, click on the following link.
Exped Ultralight 300 45
Backpacking Samurai Thoughts
You probably noticed that every single sleeping bag on this list is a down bag. It is just a fact that natural down has a better warmth to weight ratio than synthetic insulation does. Technologies change, and this might flip in the future, but right now, if you are looking for the lightest sleeping bags, especially for summer ultralight backpacking, down is the way to go.
The list of sleeping bags above has a wide range of prices. The cool thing is that the more affordable sleeping bags actually stack up quite well against the higher priced bags. My favorite summer bag is the MontBell UL Super Spiral Down Hugger with its 1 pound 2 ounce weight and excellent comfort, but a close second is the Mountain Hardwear Phantom 45 (one ounce heavier than the Super Spiral). Any one of these sleeping bags would provide excellent summer sleeping comfort, and exceptional warmth to weight. Hopefully, this guide will get you started on your search for a summer sleeping bag to fit your needs.
What do you think of the list of summer sleeping bags above? What is your favorite summer sleeping bag? What sleeping bag do you use for ultralight backpacking? Let us know in the comment section below. Thanks for reading!