Small, easy to access tools can make everything from tying an emergency nail knot to de-hooking a fish fast and easy
Knot tying tools have the most significant market share of potentially useful tools for fly anglers. When it comes to having tools with you aboard a boat, in your fanny pack on walk-in fishing outings or stuffed in your waders while fishing your favorite river or stream, some tools lose their useful glow and live out their lives waiting to rust.
Practical is the first, and perhaps the only reason to own a tool
NOTE: We collected a sample of each of these tools that we did not already own, tried them all and did not list them in any order of preference, except for the first three. You can Google these items by name and get a dozen or more versions/prices to choose from.