The Sightseer lens pouch comes with:
-1 false bottom divider, you can stash memory cards or batteries under this or even stack lenses by using it as a divider in the single pouch.
The Medium Lens Pouch is designed for your midrange zooms or super wide 14-24 2.8.
These pouches and accessories (sold separately) can be attached to the Sightseer Lens Bag via 2 rows of thick, velcro backed Leather straps and also 2 side straps. This idea is derived from the standard for military use modular systems.