Must have
Just like any bit of rain gear, you hope you won't need it but it may just save your trip! This cover fits my Kelty Red Cloud 5600 (92L) just fine and packs down small. It's reasonably priced considering it will save your pack (and all of its contents) from certain water-logged ruin! Great product from an even better company!

Works Great
Covers the Red Cloud 5600 full of gear without a problem. Material appears to be strong enough for more than a few years of use.

Quality Product
I got the large for my Kelty Coyote 4750 and it fits just fine. Being that the Coyote is sort of the in between size backpack, the large is a bit loose, however this leaves room in case you filled the bag quite full. I managed to get it to fit with no problems even with my hiking poles attached to the side of the pack. The included mesh sack is always nice to help the material dry and not sour in the pack. Overall a great complement to my backpack that should have been included to begin with.

Fits
Great for Kelty brand packs. The large fits my 5600 cu. inch Comanche perfectly