If you're wondering what size binder you will need for a 151 Master Set with no cards stacked on top of eachother, we recommend a 12-pocket binder with 480 pockets.  If you were to not include promos, variants, stamped and energy cards it will fit in a 9-pocket binder with 360 pockets.

 

Here's the set breakdown:

• 151 Numbered Base Cards

• 140 Reverse Holo Base Cards

• 42 Secret Rare Cards
   

Optional Extras:

• 14 Variant Cards

• 10 Stamped Cards

• 11 Scarlet & Violet Promo Cards

• 8 Basic Energy cards

• 8 Holo Energy Cards

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In total, a complete 151 Master Set contains 377 unique Pokémon cards.