Deutor M3 with Camelbak hotshot bladder. M3; lots of room,well thought out ergonomics, VERY much air flow on my back,insulated , looks good,fits low on my back when I want it and adjusts up or down real quickly, good price at full retail($60)

hotshot; 3 liter,baffled bladder, insulated bladder,tube,and valve( I had the water in my tube AND bag freeze during a ride last year. no more). hydrolock is great to keep from accidentily wasting water on long trips, big opening for cleaning and ice cube insertion $35
under $100 full retail I have Exactly the hydration pack I want. without having to sell a kidney to pay for it