I purchased the Blizzard Survival tube
http://www.ps-med.com/products/detail.php?p=16
$38.00 with shipping.
Tested it last night. It got down to 39 in San Diego and I was comfortable all night. The openings on each end seemed to prevent condensation. 19 oz under $40 .. a good three season top and bottom solution. Repacks into old compression sack nicely....
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