You can never pack a Porter again
In one sense, the form creates a framework. In another, the framework mutates and composts. Enter Yoshida Porter, a bag company that you have maybe never heard of, or which you think is a smaller deal than it is.
Porter is everywhere in Japan. It is as if JanSport were luxe. Go on the Yamanote Line and count the Porter bags. All genders, yes, but mostly dudes. Their most famous is the Tanker line, a sort of puffer jacket of a thing, all nylon, patinas but not rips. There are lines of fabric & trim; lines contain specific items, bags & wallets & clutches of all sizes.
There is a system to Porter. You know what a Porter wallet is going to look like. It is materially the same form from wallet to wallet. They change the color, add some piping, switch from canvas to leather. The logo patch remains the same. This is how they are able to roll out new lines quickly, but also make a bunch of collabs.
This is how you get, for example, Totoro. The bags are the same as all the other bags, they are just also Totoro.