One of the things I like with the Manfrotto bag is that the camera and its lenses are in a compartment I can access while keeping a strap on my shoulder. I had to take the LowePro off every time I needed to get inside it.
But I've noticed that when I've opened the camera compartment, some of my lenses were slipping. I almost lost a nifty-50 that way. I needed to find a way to secure the lenses better.
The solution was at the local dollar store.
Inside the camera compartment, it uses hook-and-loop fasteners (the generic form of Velcro fasteners) to secure the compartment dividers. I decided to take advantage of that to secure my gear.
I bought a 10-piece set of 1-inch square hook-and-loop fasteners (generic Velcro fasteners) at the dollar store (the one I went to was Dollar Tree, but the names vary depending on where you live but the concept is the same; everything is a buck).
I cut a hook piece in half, so it was .5 by 1 inches, and used the adhesive backing to apply it to the middle of my lens cap. It worked, in the sense that the piece on the lens cap caught hold of the inside of the bag, but it came right off.
I solved that by using hot glue to attach it to the cap. I would recommend using one of the genuine hot-glue guns and not the "cold" guns, as the hot ones have a stronger adhesive. And it worked, keeping my lens secure.
I've since applied it to all my lenses, and found it can even secure the camera body when the lens is attached.
As a side benefit, the fasteners can also be used for holding on to the caps. You can either stick it inside the bag, put a piece of loop material on your camera strap or put some on one of those lens-cap tethers. If you do the latter, I would recommend attaching the tether to the strap lugs on your body instead of the lens, since it likely will get in the way on the lens.
