STEP 3. Release excess air using the nipple.
And for added compression or if you need an extra chair, you can always sit on it. The straps should tighten all the way for maximum compression on full sized sleeping bags up to 20 degrees. The bag is also waterproof, for withstanding all of the elements*.
*Disclaimer: Bears do not fall under "the elements". Bear attacks, bear hugs, and bears in your sleeping bag are not issues covered by the Ortlieb compression bag.
No more worrying about how you're going to put away your sleeping bag! You can just sit back, relax, and be a happy camper!