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Russell Steen
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This does not answer your direct question in the sense that it does not prevent condensation (so please bear with me), but..

..a lightweight bivy with a water resistant and very breathable (rather than waterproof) top fabric on top of a groundsheet will protect your sleeping bag from the outside and add a bit of warmth. These weigh from 100-200g upwards, depending on fabric thickness.

I got mine from Mountain Laurel Designs. Right now there is only one model, although he used to do a plethora of options - perhaps worth asking if you think it looks too flimsy or too expensive.

For example this one:

http://www.mountainlaureldesigns.com/shop/product_info.php?cPath=22&products_id=30

Not cheap though - there is an older thread on Backpacking Light with a discussion and a few more suggestions:

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=12382

This does not answer your direct question in the sense that it does not prevent condensation (so please bear with me), but..

..a lightweight bivy with a water resistant and very breathable (rather than waterproof) top fabric on top of a groundsheet will protect your sleeping bag from the outside and add a bit of warmth. These weigh from 100-200g upwards, depending on fabric thickness.

I got mine from Mountain Laurel Designs. Right now there is only one model, although he used to do a plethora of options - perhaps worth asking if you think it looks too flimsy or too expensive.

For example this one:

http://www.mountainlaureldesigns.com/shop/product_info.php?cPath=22&products_id=30

Not cheap though - there is an older thread on Backpacking Light with a discussion and a few more suggestions:

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=12382

This does not answer your direct question in the sense that it does not prevent condensation (so please bear with me), but..

..a lightweight bivy with a water resistant and very breathable (rather than waterproof) top fabric on top of a groundsheet will protect your sleeping bag from the outside and add a bit of warmth. These weigh from 100-200g upwards, depending on fabric thickness.

I got mine from Mountain Laurel Designs. Right now there is only one model, although he used to do a plethora of options - perhaps worth asking if you think it looks too flimsy or too expensive.

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nsandersen
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This does not answer your direct question in the sense that it does not prevent condensation (so please bear with me), but..

..a lightweight bivy with a water resistant and very breathable (rather than waterproof) top fabric on top of a groundsheet will protect your sleeping bag from the outside and add a bit of warmth. These weigh from 100-200g upwards, depending on fabric thickness.

I got mine from Mountain Laurel Designs. Right now there is only one model, although he used to do a plethora of options - perhaps worth asking if you think it looks too flimsy or too expensive.

For example this one:

http://www.mountainlaureldesigns.com/shop/product_info.php?cPath=22&products_id=30

Not cheap though - there is an older thread on Backpacking Light with a discussion and a few more suggestions:

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=12382