"I'll add a couple of other notes about the lower modular pocket that might not be obvious from these photos: First, even on the dyneema version, the bottom and "back"--the side that is against the Smart Alec--are black cordura to match the pattern of the Smart Alec itself. Second, there is a small pocket against the "back", mirroring the inside pouch of the Smart Alec. Nice design touches to have the lower modular pocket mirror the main bag in such a way."

Read the full post by autolycus in the Forums. See also: the Smart Alec and Smart Alec Modular Pockets & Straps.