MSR E-Bivy Ultralight or Emergency Bivy Sack 2011 Version Nylon It is typically described as

It is typically described as having the strength of steel with a weight comparable to aluminum

1oz/30g Ultra-Sil' Dry Sack - 13 (L) Liter 8

This hardened shell also encapsulates the aluminum

Cordura stuff sack

MSR E-Bivy Ultralight or Emergency Bivy Sack 2011 Version Nylon It is typically described asThe diminutive, weather resistant E Bivy sack adds the ideal amount of protection for wide range of situations without adding much to your pack. It will block wind, dew, spindrift and even light precipitation, adding valuable warmth and comfort when used under tarps, on open bivies and for winter camping. It can also be tossed into a pack lid on any trip, providing essential protection for an unplanned night in the hills. Highly Breathable: Increased