One Piece Card Game booster boxes are 24 packs, and a case is 12 boxes. Compared to Magic or Pokémon, the value curve is unusually steep: a single Manga Rare or Special Card Parallel can be worth more than an entire box, while the Rares and Super Rares that make up the bulk of the pulls trade for a few dollars each. That combination — cheap bulk, extremely expensive chases — is exactly the situation where splitting by card count falls apart and a weighted split with fixed-cost overrides earns its keep.
How One Piece rarities break down
Every One Piece booster pack contains 12 cards. In a standard set you can expect roughly: 6 Commons, 3 Uncommons, 2 Rares, and one slot that resolves to a Super Rare, a Secret Rare, a Leader, or an alternate-art parallel. Across a 288-pack case that means hundreds of near-worthless cards and a couple dozen cards that carry almost all the value.
- Common (C) — 0.2
- Uncommon (UC) — 0.3
- Rare (R) — 0.6
- Super Rare (SR) — 1.0 (baseline)
- Leader (L) — 1.2
- Secret Rare (SEC) — 2.0
- Special Card / Alternate Art Parallel — fixed cost
- Manga Rare — fixed cost
Setting Super Rare as the 1.0 baseline rather than Rare is deliberate. In One Piece the Rare slot is guaranteed twice per pack, so Rares are effectively bulk-adjacent. Anchoring the baseline at SR keeps the ratios intuitive when you talk about them with your group.
Why parallels belong on fixed cost
One Piece alternate arts are not a modest step up from the base card — they are frequently 10x to 50x the price. A Manga Rare from a hyped set can run several hundred dollars on its own. If you weight it at, say, 3.0 alongside a Secret Rare at 2.0, the person who pulled it walks away with a card worth ten boxes for barely more than someone who pulled a normal SEC. That is the fastest way to end a group split permanently.
If a single card could pay for a third of the case on its own, it does not belong in the weight column. Give it a fixed cost at agreed market price.
Agree on the price source before you open. TCGplayer market price at the moment of opening is the most common convention, because it is public, timestamped, and nobody can argue it was cherry-picked after the fact.
Worked example: a $1,450 case, four people
Four friends split a 12-box case at $1,450 delivered. They agree on the weights above and on TCGplayer market at open for any parallel.
- Ana pulls a Manga Rare valued at $420 and claims it as a fixed cost.
- Ben claims an alternate-art Leader valued at $95, also fixed cost.
- Everything else — Commons through Secret Rares — is claimed by weight.
- Final weighted totals: Ana 46.2, Ben 51.8, Carla 58.4, Dan 49.6. Total 206.0.
Fixed costs total $515, leaving $935 to split by weight. Ana pays $420 + (46.2/206.0 × $935) = $420 + $209.71 = $629.71. Ben pays $95 + $235.10 = $330.10. Carla pays $265.13. Dan pays $225.16. The four figures add to $1,450.10 — rounding to the cent, which Case Split handles for you.
Note what happened: Ana paid roughly 43% of the case for one card plus her normal share. She agreed to that in advance because the alternative was paying a quarter of the case and keeping a card worth almost a third of it — a trade the other three would never accept twice.
Handling Leaders and Don!! cards
Leaders are a separate rarity class and their value depends entirely on competitive relevance rather than print run. A meta-defining Leader can outprice a Secret Rare. Two options work well: give Leaders their own weight row and adjust it per set once the meta is known, or treat any Leader over an agreed dollar threshold ($25 is a common line) as fixed cost. Don!! cards from promo packs are usually weight 0 unless your group specifically wants them.
Pre-release and Japanese product
Japanese One Piece product has a different rarity distribution and materially different secondary prices from English. Do not reuse an English weight sheet on a Japanese case without checking. If your group splits both, keep two separate cases in Case Split rather than mixing product in one — the math is fine either way, but the audit trail is much clearer when English and Japanese are separated.
Setting this up in Case Split
Create a new case, pick One Piece in Step 1, and Step 2 pre-fills the rarity list above. Adjust any weight your group disagrees with, set the case cost in Step 3 including shipping and tax, add your participants, and start logging cards as you open. Parallels go in with a fixed cost and no weight. The Split panel recalculates on every assignment, so you can see exactly what each person owes before anyone commits.