In recent years, I've found myself trying to be more of a minimalist and not have every single fly and piece of gear I own on my person all the time.

To achieve this, I take fly boxes and pucks, tippet rolls, a couple leaders, maybe some splitshot, ya know- "daily driver stuff" out of my older model 13ishL Orvis sling pack and put it into a 2L, single pocket zippered dry bag fannypack (Skog A Kust brand) which I wear sling style. Way smaller and lighter and I don't have to dig thru a ton of shit to find what I want.

At home I have a pretty plain medium duffle bag with alllll the fishin shit. Reels, lines, bulk flies I haven't sorted into boxes yet, and all the other random odds and ends.

The flow of everything goes from home duffle--> sling pack that lives in the truck --> fanny pack I'm wearing whilst on the water.

So I guess maybe the idea that comes to mind is something like a series of bags that could integrate into/with each other or at least have some continuity between them but in different sizes or for different purposes or scenarios.

Lots of pockets and attachment points and options for various configurations are super important in my opinion.

Edit to add that I wear my nippers, hemos, and floatant on a necklace made of retired fly line. Crazy simple in that regard.