I have a Osprey Stratos 24 that I've been using a few years and it does a good job of transferring heavier weights to my hips with it's alloy frame and cross struts. It's heavier than some at about 39 oz(for the large) but compensates in load carrying comfort plus it even has a built in rain cover which has come in usefull here in the Northwest.

It's always a question of weight versus comfort which is an important consideration with either a daypack or backpack.