Nice to have along just in case a storm hits in the middle of your extended backpacking trip.

At only 4.5 ounces the Osprey UL Raincover (Large) takes up very little space in your backpack yet comes up big when bad weather strikes. Taking a few moments to place this fully seam taped fly on your pack when the first drops fall is much better than spending a whole day post-storm spreading your gear out on rocks waiting for everything to dry out. On cold clear nights the UL Raincover (Large) also does a great job of keeping dew and frost off your backpack.