"Here's an initial review of my first adventure with the steel dyneema/wasabi Synapse 25. Shout out to dorayme for her wonderful comparison shots of the 19 and 25. I do a week or less trips, at least twice a month and a total sucker for backpacks. I can manage with a 15 liter pack for a 2-day trip. The cavernous S25 was perfect for the 3-4 days mix of business and leisure. I believe I can do a week with just the S25 (excluding cold weather areas)."
Read roadpotato's full review/trip report (with more photos) in the Forums.