I have the medium organizer, and love it. But when packing for an airplane trip this past January (suitcase space is prime), I found the medium bag too large, and had to find something smaller for the trip. When I saw the organizers on sale, I purchased the smaller one - It's a great size and fits all the necessary items for travel. You're limited, so you learn to JUST TAKE WHAT YOU NEED, which isn't always bad. The more room you have, the more you take!! I love the smaller bag. Great quality and a wonderful price on sale.....
I have had the large personal organizer for several years and love it! I purchased the small organizer to keep all my medications and paraphernalia for diabetes treatment in one place when I travel. This organizer is just about perfect for this. I can keep this stuff separate from my other luggage and quickly show it to security folks if necessary.
I've had a large personal organizer for many years and it needed to be replaced. I was able to easily put all of my old stuff into the new one--and I feel that it is easier to find things now--the sapce is better used. And I never liked the flap pocket that folded down and hung below--that is gone. I love the new one!