Spent weeks and weeks searching for the right packs we could use on our 4 week backpacking trip to Thailand, but also use for day and overnight camping hikes. We tried on dozens of packs and settled on the Sirrus/Stratos 50s for him&her. The harness is the most comfortable harness on any of the packs we tried (and we tried on dozens). This was the biggest selling point - well ventilated to keep you cool in humid climates and seamless so there are no pinch points. Totally adjustable to give the perfect fit so the pack sits on your hips and doesn't pull on your shoulders at all. The 50L packs were the perfect size for carry-on on every airline, huge money and time saver versus checking luggage! Big enough for a 4 week trip in warm climate - the floating lid means you can really over-pack this beauty as well if you need. Durable, built in rain cover, lots of pockets, hip belt pocket will fit most smartphones for easy access. Awesome pack.
Thai travel guy