Difference between evac dry sack and ultra sil dry sack?

I want to get a couple, but what size should I get for my sleeping bag in particular?

I would go with at least the 13L eVac for the Pinole 20 (no clothes though). Synthetic bags don't compress as well as down, so with the larger volume you won't have to fight to stuff it, and you'll still be able to compress it to a size that's the smallest you're going to be able to. As for other sacks- I would stay with eVacs. I'm sort of an eVent fanatic, and I like the option of being able to use it either as a waterproof stuff sack and/or as a compression sack. It's better to keep your clothes separately so you don't have to completely unpack every time you need to get your bag out. Also, remember that compression is a nice option to have, but it's not always the most efficient way to load a pack. For example- I might keep my clothing inside a stuff sack, but I always load it flat and loose.

Happy to help Casey. The added peace of mind with the durable eVAC is worth the little extra weight, and you will be amazed at how much stuff you can stuff into these. A 13L sack should work great for your MH bag and extra clothes. If your packing a backpack, car, kayak, etc. and space becomes an issue, look into using a dry compression sack to get the air out. Link as follows: http://www.backcountry.com/sea-to-summit-event-compression-dry-sack

Thanks for the quick response. I have the Mountain Hardwear Pinole: 20 Degree Synthetic (3lb 3oz). I'll probably go with the evac for my sleeping bag and clothes (go with the 13oz?). Will these sil dry sacks suffice for misc. items? Or should I just spend the extra $$ now and go with the evacs for everything?

Yeah, the Ultra-sil is a little lighter, but the eVac is the way to go. You can force the air out the bottom and compress the contents. Keeps things dryer too. What kind of bag do you have?

Casey, The Ultra-Sil has a lighter material, and the eVAC Dry uses nylon for added durability. The size of your sleeping bag, its weight and fill (down or synthetic) will have some bearing on choosing an appropriately sized stuff sack. An 8 oz bag should suit fine, but if you choose a larger sack, you can always stuff more on top of your sleeping bag with the extra room not going to waste.