Black Diamond Axiom 30 Backpack
The Black Diamond Axiom 30 Backpack is exactly what I want in a technical daypack - it gets small when I don't need space but easily holds enough for a light 1-2 night trip. The back venting works well as I took this on a hike from 45 degrees and raining to 80 and humid and didn't end up with a wet back. On the same hike my gear stayed totally dry inside the pack. The shoulder strap system on the pack really becomes noticable when you load it up past ~20 lbs and adds comfort to the pack. The only qualm is that the lid attachment system is very tricky to take on and off of the pack.
The feature that sold the pack for me is the strech pockets which can hold a ton of stuff for quick access. I was glad to have them for rain shell storage - a much better solution than my usual draping the hood of my shell over the lid of the pack and having a long train to deal with. Bottom line is this pack will do it all and can get very small or surprisingly large when you need it to.