This handy little chest pack is everything you have been asking for!! Perfect size with good size pockets to hold everything you need with the bonus of a flap down fly patch to hold your go to flies!
There is also the bonus of several loops to pop your zingers on to keep everything within reach. The main pocket would hold a decent sized fly box plus a reel, leaders, tippet, floatant, sinkant and room for more without being a bulky bag.
Sits nice on your chest with fully adjustable neck strap and waist straps.