Slimline fly box that hold 54 large sized flies in foam slits
2 Magnetic white 'working patterns' compartments that prevent flies being blown away. We use these for our tray of flies that we've used through the days fishing.
Clear view lids make fly selection easy and quick
Slots are big, I do like to label flies and this made it easy to get 2 rows in and a label. Then the magnetic compartments are great for drying out used flies as well as those that can be fiddly to get in and out of slots. The wind blows no problem, fumbling with your box in the water no problem the magnetic base keeps everything in place. Slim enough to get a few in the waistcoat and no need to take a bag.
Try terms like "sinking fly line"