
The Cosmic 20 comes in 3 sizes: Short - fits up to 5'6", Regular - fits up to 6' and Long - fits up to 6'6". Chanda has the short and I have the long although, to be honest, the long is more sleeping bag than I need - being 5'10" (But at the time of it's purchase, it was on sale so it's what I ended up with). Chanda's bag weighs in at just about 2.5lbs and mine just about 3lbs. As with all down bags, they compress quite nicely and pack into the bottom of our bags just fine.
The Cosmic 20 shell and liner are made of 50D Down-proof Polyester. There are advantages and disadvantages to the heavier fabric used in this sleeping bag compared to the 10D and 20D fabrics used on more expensive bags. The advantage is durability. This is a sleeping bag that will take a lot of abuse. Wanna throw it right on the ground? No worries! Toss it up into a tree to dry out? Go for it. The heavier material is far more durable and puncture resistant than it's lightweight counterparts! It's also far more wind resistant, meaning that if you're sleeping under a tarp and the wind is ripping through camp, this bad boy won't be robbed of warmth as much as some higher end bags. The downside is that it isn't as breathable. This means that the Cosmic 20 will feel stuffy at lower temps than a highly breathable bag. Additionally, it will take longer for moisture to escape and dry out. So, don't tuck your head inside or you could be sleeping in a wet bag for the rest of your trip.
The Kelty Cosmic Down 20 is my go-to recommendation for anyone in the market for a budget down sleeping bag. I anticipate getting many years of use out of ours. And I love that I can feel confident passing them down to our children (as we upgrade our equipment) knowing that they will be snuggly tucked in a bundle of downy goodness on chilly spring or fall backpacking trips. If you are looking to take the leap from synthetic to down, I highly recommend checking out the Kelty Cosmic 20.