I saw these covert inserts being offered over a year ago but couldn't figure out an application for it, since most my gear has Molle attachments both inside and out. I even tried to find YouTube videos to see how other people are using them but didn’t find jack and 5.11 doesn’t give you much to work with.
I recently bought 5.11 Covrt M4 Shorty for my IWI Tavor and the 20.75” x 10” x 3.75” front compartment is just one big void without any Molle or internal pockets for storage and organization. So I bought the Covrt Small Insert to remedy this problem. I placed 4 Double stack AR magazine pouches on the front and on the back I have the 6.10 vertical pouch. Fully loaded fits perfectly in the front compartment of the M4 Shorty. That’s when I realized I can swap this insert from one bag or another or even into a Nike Back pack for true covert concealment.
I have invested a small fortune in Molle gear. Each of my 4 bags have both internal and external molle and I have ammo pouches permanently installed in each of the them, simply because it's a pain to uninstall/reinstall them from one bag to another. If I had known about the inserts I would have saved a fortune. I could have easily configured the inserts with Molle attachments and simply move the insert from one bag to another.
I plan to buy both the large and another small insert.