Japanese White Flare Pack Weight Test | 20 Packs Measured for SR, AR, RR & Mirror Cards
In the previous test, I measured 20 packs from the Japanese Black Bolt expansion and compared pack weight with SAR, AR, RR, Poké Ball Mirror, and Master Ball Mirror results.
This time, I tested White Flare.
For this experiment, I used 20 seven-card packs from an unopened Japanese White Flare booster box that I purchased myself.
Every sealed pack was weighed individually to the nearest 0.01g. I then opened all 20 packs and recorded the relationship between pack weight, card rarity, and Mirror Holofoil cards.
The measured packs ranged from 11.74g to 11.86g.
However, SR, AR, RR, Poké Ball Mirror, and Master Ball Mirror results overlapped within similar weight ranges.
Therefore:
Pack weight alone could not accurately identify the rarity or Mirror Holofoil card inside an unopened pack.
This article documents an experiment into whether what is commonly known as “pack weighing” can actually distinguish the contents of unopened booster packs.
It is not intended to encourage weighing packs in stores, selecting packs by weight before purchase, or selling packs that have been sorted by weight.
Pack weight may also be affected by the wrapper, printing, card finishes, Mirror Holofoil treatments, manufacturing variation, and the measuring environment.
The measurements in this article are results from this specific booster box and these 20 packs.
They should not be treated as universal standards for other boxes, production batches, or loose packs.
Test Conditions
The test was conducted under the following conditions.
- Product: Japanese White Flare expansion
- Purchase format: unopened booster box
- Number of packs measured: 20
- Cards per pack: 7
- Every pack was weighed while sealed
- Measurement precision: 0.01g
- Location: normal indoor environment
- All packs were opened after weighing
- Card rarity and Mirror Holofoil type were recorded
Japanese White Flare includes Poké Ball Mirror and Master Ball Mirror cards in addition to standard cards and higher-rarity cards.
This means differences in pack weight may not be caused only by higher-rarity cards such as SR or AR.
The foil wrapper, printing coverage, surface treatment, type of Mirror Holofoil card, and other manufacturing differences may all affect the final measurement.
For this reason, the numbers below should not be treated as absolute thresholds.
They are real measurements used to compare 20 packs relative to one another within the same booster box.
White Flare Pack Weight Results: 20 Packs Measured
The 20 packs measured in this test ranged from:
Measured range: 11.74g–11.86g
Difference between lightest and heaviest pack: 0.12g
This booster box produced SR, AR, and RR cards as well as Poké Ball Mirror and Master Ball Mirror cards.
However, no single rarity was concentrated exclusively at the heavier end of the measured range.
Different rarities and Mirror Holofoil results appeared within similar weight ranges, creating substantial overlap across the dataset.
What the Measurements Showed
The main findings from these 20 packs were:
- The overall pack-weight range was 11.74g–11.86g
- The Master Ball Mirror appeared at 11.82g
- RR cards appeared between 11.75g and 11.83g
- The SR appeared at 11.78g
- AR cards appeared between 11.77g and 11.82g
- Multiple rarities and Mirror Holofoil cards overlapped within similar weight ranges
Some relatively heavy packs did contain higher-rarity cards or special Mirror Holofoil cards.
However, an RR appeared as low as 11.75g, while the SR appeared at 11.78g rather than at the heaviest end of the box.
The results therefore did not show a simple relationship where heavier packs consistently contained higher-rarity cards.
Master Ball Mirror Pack Weight
The Master Ball Mirror card found in this test came from a pack weighing 11.82g.
This was toward the heavier end of the overall measured range.
However, AR and RR cards also appeared around similar weights.
The only conclusion supported by this test is:
In this booster box, the Master Ball Mirror was found in an 11.82g pack.
This does not mean that packs around 11.82g contain a Master Ball Mirror or that heavier packs are more likely to contain one.
Only one Master Ball Mirror was observed in this booster box.
More boxes would need to be tested before evaluating whether any repeatable weight pattern exists.
SR Pack Weight
The SR found in this booster box came from a pack weighing 11.78g.
This is particularly interesting because 11.78g was not at the maximum end of the 20-pack weight distribution.
The result shows that an SR does not necessarily make a pack one of the heaviest in a booster box.
Other rarities and Mirror Holofoil cards also appeared around the 11.77g–11.79g range.
Therefore, the SR could not be identified by pack weight alone.
AR Pack Weight
AR cards appeared in packs weighing between 11.77g and 11.82g.
This range overlapped with RR, SR, and Mirror Holofoil results.
No weight range unique to AR packs was observed.
It is possible that the special surface treatment of AR cards affected their weight slightly.
However, any such difference may have been small enough to overlap with variations in the wrapper and the other cards inside the pack.
As a result, AR packs could not be separated reliably from other packs using weight alone.
RR Pack Weight
RR cards appeared across a particularly wide range from 11.75g to 11.83g.
This included both relatively light and relatively heavy packs.
Because RR cards appeared across such a broad range, their presence could not be determined simply by looking at the total pack weight.
The same range also contained SR, AR, and Mirror Holofoil results.
Therefore:
No clear weight boundary was found that could separate RR packs from other pack configurations.
How Poké Ball Mirror Cards May Affect Pack Weight
Japanese White Flare includes multiple cards with the Poké Ball Mirror Holofoil pattern.
It is possible that the additional foil treatment contributes some weight compared with a normal card.
However, Poké Ball Mirror packs did not cluster within one clearly defined weight range in this test.
A pack without an SR or AR could still be slightly heavier because of a Mirror Holofoil card.
Likewise, a pack containing a higher-rarity card could still weigh less because of variations in the wrapper or the other cards inside.
These overlapping factors make it difficult to isolate the effect of a Mirror Holofoil card using total pack weight alone.
Comparing White Flare With Black Bolt
The previous Japanese Black Bolt test produced a measured range of 11.71g to 11.83g.
Japanese White Flare ranged from 11.74g to 11.86g.
The results can be compared as follows.
- Black Bolt: 11.71g–11.83g
- White Flare: 11.74g–11.86g
- Both products showed substantial overlap between rarities and Mirror Holofoil cards
- Neither product allowed the contents of a pack to be accurately identified by weight alone
In these two booster boxes, the White Flare packs were distributed slightly higher overall than the Black Bolt packs.
However, this comparison is based on only one booster box of each product.
The difference could be related to the products themselves, but packaging variation, manufacturing differences, or individual card combinations may also have contributed.
For that reason, these measurements should not be treated as universal differences between Black Bolt and White Flare.
Can Japanese White Flare Packs Be Weighed to Identify Rarity?
Some relatively heavy packs in this booster box contained higher-rarity cards or a Master Ball Mirror.
However, the complete dataset also showed:
- The SR appeared at 11.78g rather than at the heaviest end of the box
- RR cards ranged widely from 11.75g to 11.83g
- AR cards overlapped with other rarity ranges
- Mirror Holofoil cards may also affect the total pack weight
- Multiple different contents appeared within similar weight ranges
Based on these results, pack weight showed some variation within this booster box, but it could not accurately identify SR, AR, RR, Poké Ball Mirror, or Master Ball Mirror packs.
The measurements in this article should be viewed as data from a fully opened booster box, not as weight thresholds for selecting packs.
Summary of the White Flare Pack Weight Test
The 20 Japanese White Flare packs measured in this test ranged from 11.74g to 11.86g.
The main results were:
- Master Ball Mirror: 11.82g
- SR: 11.78g
- AR: 11.77g–11.82g
- RR: 11.75g–11.83g
- Multiple rarities and Mirror Holofoil cards overlapped within similar weight ranges
- Pack weight alone could not accurately identify the contents
Some relatively heavy packs contained higher-rarity cards or the Master Ball Mirror.
However, the SR appeared around the middle of the measured distribution, while RR and AR cards covered relatively broad weight ranges.
Because White Flare also contains both Poké Ball Mirror and Master Ball Mirror cards, several different types of foil treatment may contribute to small differences in overall pack weight.
For this reason, the data from this booster box does not support the idea that simply choosing a heavier pack would reliably identify a higher-rarity card.
This is the third pack-weight dataset published on the English version of tekemero.com.
With Black Bolt and White Flare now measured under similar conditions, the results also provide an initial comparison between two seven-card Japanese booster products.
I plan to continue adding new test data and compare whether similar patterns appear across other booster boxes and products.
