Touring - what size dry sack for my big agnes bag and pad?

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NeezyDeezy
08-14-07, 01:27 PM
I don't have a local store I can easily take these to, and I was wondering what size Sea-to-Summit dry sack I should buy if I want to be able to store my big agnes crystal sleeping bag (long) without taking out the insulated aircore pad out. I'd like to go with one of these:

http://www.rei.com/product/730877?ext_cat=undefined

but I don't know if I should buy the medium or large...