Would this work for a carry on size wise?...
Would this work for a carry on size wise? I would like to take three large spinning reels with me on board instead of having them destroyed in check through like the last trip.
Without having used this pack personally, the typical carry-on size restrictions for most commercial airlines is a combination of dimensions that equal no more than 45 lineal inches. At 20x11x6", this easily falls below those requirements, and you should have no problems at the gate or stowing it in the overhead.
I have used it multiple times as a carry on size and have had no problems whatsoever with it from Asia to Alaska to the Virgin Islands. You're good to go!