Free: Contests & Raffles.
I want to venture out and try something other than exo but I'm afraid I won't find customer service like theirs anywhere else. They hang out on the Facebook groups too answering questions and getting people squared away. They're pretty awesome.
I have the K-3 1800 with a lid and also like it a lot, no complaints. EXO also offers a discount to military and first responders. My only wish is that the bags were waterproof or repellant so when it rains the bag doesn't get soaked.
one sorta complaint I got is the pack is loud when you're going through brush with it on, I've been thinking about a cover to quiet it down and maybe help shed rain