The 2-pack mystery bundle comes with 2 Pokemon booster packs, one Japanese and one English, and one 20-card mystery pack.

Booster packs:
—1 Japanese and 1 English pack guaranteed

[SWSH, S&V, and Mega sets]

Mystery packs:
—10 common cards, 5 reverse holos, 3-5 holo rares, and 1 RR / SR card

[2 bundles guarantees you an Illustration Rare Card or better!]