Most of the decision here is simple: this is Umpqua’s Large UPG Foam Magneto, sized 7.25" x 4" x 0.75". It’s a slim box that still gives you structured storage, thanks to deep foam dividers and strong magnets that help keep flies in place.
This layout leans toward speed. The magnetic, quick-access compartment is meant for flies you rotate through often, while the divided sections keep the rest separated and easy to grab. The shell stays lightweight, so it carries well without adding bulk. If you want one box to cover a wide mix and you don’t need oversized depth, this format makes sense.
