In reply to nickinscottishmountains:
I have to disagree. The DMM Flight includes a tarp and has pockets etc. to help organise things and is hand luggage size for flights as well as having front access to all the contents. I hate having to tip the contents of a sack out onto the ground to get to things at the bottom. I've long been a fan of panel/clam shell style openings on trad sacks for use in the UK but they are fairly rare. I like the idea of the Beal opening at the back but there doesn't look to be much in the way of pockets etc. and it's smaller, 35 litres compared to 45 for the DMM.
Are you sure you are talking about the same sack, it was only released this year?