Figured I'd report back for anyone curious:
Gaylord Archival has item # ESM584 which are 4 mil 5 1/2 by 8 1/2 mylar bags. Combined with some thick acid free backing boards cut down to size the card fit snugly but not problematically so, if you pinch the sides they gently slide in and the tension holds them roughly centered to prevent corner bumping.
It might not be "perfect" but they are thick and feel good in the hand. The mylar is clear and bright.
Any cards with cellophane have the cellophane slid into the back side of the sleeve for safekeeping.
Next up I'm researching whether any of the grading services also offer archival/encapsulation. I don't need to pay for grading but it would be nice to have the more valuable cards in the set encapsulated for long term storage. Does such a thing exist?
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