Mountain Hardwear 3rd Dimension 0°

This is an exellent bag, and could probably keep you warm down to -5. There is plenty of girth around the shoulders, which makes the bag a little heavy but gives you the option of wearing lots of insulating layers in extreme temps. It doesn't pack down real small though because of the extra girth and the quantum draft tube which allows you to expand the draft tube for warmer nights. This is a nice feature if you thrash around alot in your sleep and like lots of room, otherwise it just adds the weight of another full length zipper. A good all around quality bag.

Great bag when it was new. After one season the Polarguard was paper thin. This bag certainly does not stand up to a lifetime of abuse. My buddy's cheapo REI Polar Pod has lasted longer and stayed warmer.