I've been backpacking for over 4 years now. I tried on many backpacks and gone through about 4 different internal frames before I found my Eureka Torrid. However, my wife wants to start backpacking and I don' t have a clue about womans packs. How should they ride, different suspension, etc. I'd perfer that she bought an internal frame. Any suggestions or stores. We wil be checking out REI this Sunday. Any online stores?