Thrush false bottom sleeping bag
The Thrush is a false bottom sleeping bag. This is a full sleeping bag that wraps all the way around the sleeper, just without the insulation in the bottom where it is compressed and has limited effectiveness in a traditional bag. It has no zipper and venting is accomplished with the top drawcord and/or with the optional bottom drawcord at the footbox. This design pushes weight savings well below traditional bags and even below quilts, but performs totally draft free like a full sleeping bag. The drawcords provide plenty of venting for most people without the weight, bulk, and complication of zippers but it should be noted thatone can be installed, initially or post sale. It is important with any sleep system that it is paired with a sleeping pad rated to similar temperatures. It is especially important with quilts and false bottom bags and it should be noted that pads that utilize empty spaces are generally not suitable for these types of sleep systems.
This should be used with a Waterbear hood or can be used with other types of head insulation.
http://www.timmermade.com/store/p18/Climashield_Waterbear_hood.html
http://www.timmermade.com/store/p72/Down_Waterbear_hood.html
This can be paired with a Merganser overbag that clip together with it
http://www.timmermade.com/synthetic-overbag-for-moisture-management.html
All sleep systems are 20% overstuffed. Combined with vertical split baffles, there is very little down migration. A drawstring footbox that opens up for venting, wearing the system around, etc is optional for no extra charge. It usually adds .5 to 1oz to the finish weight of any given system.
Read up on the design features:
http://www.timmermade.com/false-bottom-sleep-system.html
http://www.timmermade.com/differential-cut.html
http://www.timmermade.com/non-integrated-hood-sleep-systems.html
http://www.timmermade.com/vertical-split-baffles.html
http://www.timmermade.com/overstuff.html
http://www.timmermade.com/venting-without-zippers.html
Approximate weights can be found here. Scroll down to the model, then to the size/temp rating to find weight.
http://www.timmermade.com/weights.html
Width is the circumference at the top/hip/foot and the length is the max user height.