While this bag is no longer available, we have many recommendations of bags that are.
The Sierra Designs Cloud 15 has been replaced by the Sierra Designs Cal 13, which uses hydrophobic treated DriDown.
If you're looking for a top-tier bag that prioritizes weight savings, which is what the Cloud strives for, we suggest considering one of the bags found in the Ultralight Sleeping Bag Review. Also check out the Backpacking Sleeping Bag Review to compare traditional style bags with fixed hoods. We've left the Cloud's review intact below in case you find one for sale somewhere.