I love the interior layout and overall styling of the Collins Slim Brief, and one of the deciding factors for purchasing this bag and not another was the exterior pouch. Ideally, I could store my transit card, keys, and anything else that I needed fast access to while on the move.
However, if you make even minimal use of the bag's interior or exterior layout, it is nearly impossible to get the bag's hook closure through its loop. It requires laying the bag down and playing extensive tug of war with the fabric to get it closed. There is no such thing as fast access on the move without then leaving the exterior pouch—otherwise only kept shut by a small circle of velcro—open for easy access to everyone around me as well.