I’ve been using my first Tacky Big Bug Box for a couple of months now and am sold on its design, especially the holding power of the silicon mat. Fly boxes tend to get bounced around a lot in my kayak and I’ve always found myself dealing with a few loose flies that fall out when I go to change flies. That doesn’t happen with the Big Bug Box. Once a fly is in its slot, it stays there. Additionally, even foam slotted boxes that hold well, tend to get chewed up over time as flies are removed and added to the box. I’ve used my first box in both fresh and saltwater swapping out flies several times and have been very satisfied with its performance. The overall design is outstanding and the magnetic latch system is very sure. Size wise, the box will hold an ample selection of flies for any application, yet it is compact enough to fit in most shirt or pants pockets. I routinely add Velcro to the bottom of my boxes to secure to the deck in the kayak, and this one is no exception. I have been so satisfied with this box that I acquired three more to deal with some variety in my fly boxes. It’s not a cheap box, but should provide many years of service. If there is one shortcoming, it is that the box is not watertight even with the very tight magnetic latching and if dropped in the water or floated around in the bottom of the kayak, it will eventually take on some moisture. It really is a good big fly box.