After my recent dall sheep hunt, I know I need a different day pack. My current pack is a crooked Horn Master Guide pack which is ok for most hunts. However, when it is slightly overloaded it sags (no frame at all). While climbing for sheep, I usually had a lot of water and some gear. The amount of space it has 1,950 inches is just about right.

Anyone have any suggestions for a day pack that is about:

2,000 cu inches
some type of internal frame
light weight
waterproof

I'm not asking for too much am I?