Here are a few pics of my Colossus with one of the 10X4 water bottle holders attached. You could attach another one to the other side if you wanted to be able to carry two long lenses. I have a 3X5 zipper pocket and a battery carrier pouch on the other side of mine.
Overview
75-300 Zoom Lens in Water Bottle Holder
The Inside is Padded
There are two concealed carry pockets - one with a zipper and one with a snap and Velcro.
Zipper Pocket with Glock 17
Snap/Velcro Pocket with Glock 17
Hope the pics help.