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40L Wisport Zipperfox. Carried it for three months in SEA and was able to pack everything in it I needed. I use it to pack for trips out of town, and when I'm home it sits loaded up to go. I was able to cinch it down to carry on size for smaller local airlines in Asia.
Layout is dope, you can get to anything inside of it by moving a zipper 6" either way.
When it's time to go my entire sleep system fits inside the bottom straps, all of the things in side of it go on the outside, and I have 40L of space to pack food and clothing. Can't recommend it enough.