My TT Contrail only got condensation twice, both times at the same campsite close beside a stream in the high Sierras at 8,000 ft.. Both times the condensation froze inside (temps in the mid 20s F. by morning). Never had condensation in rainy weather.

The warm stream and cold air did it. Companions camped 30 feet highter on the hill had no problems at all in their single wall tents.

Eric
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"There are no comfortable backpacks. Some are just less uncomfortable than others."