The Aqua Salt Fly Box is designed for fishing situations where flies take up more space: streamers, saltwater imitations, compact pike flies, or patterns tied on stronger hooks. Its larger capacity prevents materials from getting crushed and allows you to clearly see the contents before changing flies. The waterproof construction protects the boxes when carried on a boat, in a float tube, or in a bag exposed to splashes. The slotted foam helps organize flies by size, density, or color without mixing up the hooks. This is the size to choose when a standard Aqua box becomes too small for longer or bulkier flies.