Compression sack for sleeping bag

Have you considered no compression sack? A compression sack will turn your bag into a hard lump that will be hard to pack around, leaves dead space inside your pack, and could compress your insulation more than is needed. All I do is put my quilt (rather than bag) in the pack first, spreading it around in the bottom to fill all the nooks and crannies, then everything else on top and I push down only as much as needed. Added bonus: no compression sack means I save weight and money (OK two bonuses).

I've had good service from Sea to Summit ultra sil compression sacks. You need to start with a sack that is roughly equivalent to the one you now have, and cinch it down from there. The specs say 9x17 for your bag. I think you'd need a large which is 9x20 and reduce from there. A medium is slightly less volume than your original sack which makes it a bit more of a pain to stuff back in when you're breaking camp. I used cheaper bags with compression sacks for years. I've never really put it to the leak test with a short duration, full immersion, but they are certainly water repellent and last for years.  You probably know this, but don't store your bag compressed at home  and it helps to get your camp set up and the bag re-lofting as quick as possible when you need the full  low temp. value. I sometimes  shake them out and fluff them up to help the process. You can still use them as a pillow,too. Just wrap them in a fleece or spare shirt.

Well, I bag the kitchen gear, and garbage goes in an outside pocket anyway. My water bag is inside, though. And to be honest, I keep my gear pretty clean, too. The tent can be an issue, though. Unless it's wet, my share of the tent usually goes inside my pack (I try to keep pretty much everything inside). Maybe I could compromise by putting the (soon-to-be) quilt in a really light pillowcase, which would protect it a little and give me a pillow case (Okay, yeah, I know the pillowcase might end up dirty or wet. But that would dry easily, and I've been thinking about carrying one anyway).

Exactly. Stuffability (is that a word? - should be) along with a little added protection. Colin Fletcher makes this point in The Complete Walker.

You guys are convincing me! Especially since I'm guessing I can make a loose sack that would be a nice pillowcase for about the same weight as the stuff sack.

Once tried the Granite Gear compression stuff sack. A few thoughts:

- Expensive
- Reduced my WM Badger to the size of a cantaloupe - rock hard, but it took too long for the down to recover. Stuffing your bag that tight cannot be good for expensive down equipment.
- Adds an extra 6 - 8 oz to your weight, which also seems counter-productive.
- Maybe the small stuff sack (the one that came w/ the sleeping bag) was designed to not harm the down when stuffed?
- Stuffing a garbage bag inside of your backpack - Rookie! Maybe a waterproof pack cover instead?

I carry an older model Gregory Deva, 60 lit pack...size medium.
www.ebay.com/itm/Gregory-Backpack-Deva-60-Size-Medium-/252701696888?hash=item3ad631e378:g:05AAAOSw7aBVENT6
which IMHO, one of the greatest pack designs ever. Even though it says designed for women, who cares if it fits you well. FYI, I'm 6', 225 lbs...like a well-worn glove.
The Deva has one large top compartment and a separate zippered sleeping bag compartment below...also has two large outside side pockets. My TT Rainbow folds up small, especially when you take out the poles (one beak pole and one long ridge pole), which then you can strap to the outside of one side of the pack, (right along side of your fishing pole). Even wet, the pole-less Rainbow fits nicely into one of the outside side pockets. BTW, the tent is the second thing taken out of my backpack, and the second to last thing packed too.

I also carry a thin, plastic-sheet ground cloth...(~8'/3')...used under the tent. There is always some room left in the full backpack - in the very top of the lower compartment...a hole just under the bear can (bottom of top compartment) and just above the sleeping bag in the lower one. This tarp is the last gear item packed and the very first thing out. Waterproof and carried anyway (nothing more to add to your weight), you fold and drape the plastic ground cloth (in the top of the lower compartment), over and around the sleeping bag. Then no need to carry a pack cover either.

just my 2¢