This is one of the lightest synthetic sleeping bags we've tested. Ordering it is not very convenient, as this bag is not available from major retailers, and only directly from the small manufacturer in MN (made-to-order, involving long delays in delivery). If you can get past the idea of ordering a custom-made bag, you might find this bag a contender. For colder temperatures and soaking wet conditions we prefer the heavier and warmer Mountain Hardwear Ultralamina 15 which is available from most major online retailers.
The 15-degree version weighs 31.7 ounces on our scale. This is our top rated bag for wet weather backpacking in warmer temperatures. It is much more versatile than traditional style sleeping bags and it uses top quality insulation that's more durable than most others.