I just keep my rotation to five tobaccos max. Lately, it’s been just three. My strongest end of the day strong blend, I don’t carry with me. But, I use several small square or rectangle tins to put my carry in. They fit in the inner breast pocket of a sports coat, or a front pants pocket, or in my pipe bag easily. I just grab a fistful out of my jar or larger round tin and put it in the smaller squarish tin.
I don’t need them, nor want them to be airtight. Those small esoterica tins, or a small square OGS tin works best, but I have a selection of Capstan and MacB’s small squarish ones I use also.
Those plastic bags just look like contraband, IMO.
Why so many blends? I like to flip back and forth between two or three blends in six to twelve pipes during the day, But, how many are you smoking in a day?