Mattress,

Well, you're right about getting soaked from the inside while packing with raingear on. Long ago, after making that "discovery" I've just put my parka over my pack top W/ the hood over my head & the arms spiral wrapped around my lower shoulder straps. This keeps me drier than no parka.

It's the cold, heavy rains I'm talking about. The kind that literally wash away your core heat. For this I always carry a UL GTX parka, like my present GTX PacLite parka. If I know it's possible there will be cold,high winds, days of rain and/or snow I'll also bring my PacLite rain pants. As you say, it's all weather dependent.

But, as an example, I'm backpacking the Grand Canyon April 15 through 21. I'll bring my PacLite parka for a wind shell as well as possible rain. The rim can still get snow in mid-April.

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