In the previous test, I measured all 10 packs from a Japanese MEGA Dream ex booster box and compared pack weight with MA, SR, AR, and RR results.
This time, I tested Munikis Zero.
For this experiment, I used all 30 five-card packs from an unopened Japanese Munikis Zero booster box that I purchased myself.
Every sealed pack was weighed individually to the nearest 0.01g. I then opened all 30 packs and recorded the relationship between pack weight and SR, AR, RR, and R results.
The results showed one of the clearest weight tendencies I have observed so far.
The four heaviest packs in this booster box all contained either an SR or an AR.
The heaviest pack weighed 8.70g and contained an AR.
Two packs weighed 8.66g, with one containing an SR and the other an AR.
Another AR appeared at 8.63g.
However, an SR was also found much lower at 8.59g.
There were also several cases where packs showing exactly the same weight produced different results.
At 8.53g, for example, one pack contained an RR while three others contained no R or higher rarity.
At 8.58g, one pack contained an RR while another contained no R or higher rarity.
Therefore:
Although SR and AR cards showed a clear tendency to appear in heavier packs within this booster box, pack weight alone could not accurately identify the rarity inside an unopened pack.
This article documents an experiment into whether what is commonly known as “pack weighing” can actually distinguish card rarity.
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 be affected by the foil wrapper, card surface treatments, printing, cutting variation, manufacturing differences, humidity, the measuring environment, and scale accuracy.
The measurements shown here apply only to this specific booster box.
They should not be treated as universal standards for other booster boxes, production batches, or loose packs.
About Japanese Munikis Zero
Munikis Zero is a standard Japanese expansion with five cards in each booster pack.
The booster box tested here produced SR, AR, RR, and R cards.
No MUR or SAR cards were observed in this particular box.
For that reason, this article focuses only on the rarities that were actually observed after opening all 30 packs.
Test Conditions
The test was conducted under the following conditions.
- Product: Japanese Munikis Zero expansion
- Purchase format: unopened booster box
- Number of packs measured: 30
- Cards per pack: 5
- Every pack was weighed while sealed
- Measurement precision: 0.01g
- Location: normal indoor environment
- All 30 packs were opened after weighing
- SR, AR, RR, and R results were recorded
The measured weight of a sealed booster pack includes both the cards and the outer foil wrapper.
Even cards of the same rarity may differ slightly because of printing coverage, surface treatments, cutting, and other manufacturing variation.
For this reason, the measurements below should be viewed as relative data comparing the 30 packs within this specific booster box, not as absolute rarity thresholds.
Munikis Zero Pack Weight Results: 30 Packs Measured
The 30 packs measured in this booster box ranged from:
Measured range: 8.47g–8.70g
Average pack weight: approximately 8.57g
Difference between lightest and heaviest pack: 0.23g
Of the 30 packs, 15 contained an SR, AR, RR, or R.
The other 15 packs contained none of those rarities.
The average weights by result were:
- SR or AR packs: approximately 8.65g
- RR packs: approximately 8.59g
- R packs: approximately 8.58g
- Packs with no R or higher observed: approximately 8.53g
Looking only at the averages, this booster box showed a clear tendency for packs containing SR or AR cards to be heavier.
However, individual packs frequently produced different results at exactly the same displayed weight.
Therefore, differences in average weight cannot be used to identify the contents of an individual unopened pack.
What the Measurements Showed
The main findings from these 30 packs were:
- The heaviest 8.70g pack contained an AR
- Two packs weighed 8.66g, with one containing an SR and the other an AR
- An AR appeared at 8.63g
- The four heaviest packs all contained either an SR or an AR
- SR cards appeared at 8.59g and 8.66g
- AR cards appeared at 8.63g, 8.66g, and 8.70g
- RR cards ranged widely from 8.53g to 8.62g
- R cards ranged from 8.54g to 8.61g
- No R or higher rarity was observed in the five packs weighing 8.51g or less
- Several identical displayed weights produced different opening results
This booster box showed a noticeable tendency for SR and AR cards to appear toward the heavier end of the distribution.
However, the SR at 8.59g demonstrates that higher-rarity cards were not limited only to the heaviest packs.
SR Pack Weight
The two SR cards observed in this booster box came from packs weighing:
- 8.59g
- 8.66g
Their average pack weight was approximately 8.63g.
The 8.66g measurement was near the top of the overall distribution.
However, another pack at exactly 8.66g contained an AR.
- 8.66g: SR
- 8.66g: AR
The second SR appeared at only 8.59g.
Packs weighing 8.60g and 8.61g produced R and RR results as well.
Therefore, even though the SR cards in this booster box were relatively heavy on average, sorting the packs from lightest to heaviest would not allow an SR to be reliably identified.
The only conclusion supported by this test is:
In this booster box, SR cards were found at 8.59g and 8.66g.
This does not mean that packs above a particular weight contain an SR or that one of the heaviest packs will necessarily contain an SR.
AR Pack Weight
The AR cards observed in this booster box came from packs weighing:
- 8.63g
- 8.66g
- 8.70g
Their average pack weight was approximately 8.66g.
All three AR packs were located toward the heavier end of the distribution.
The four heaviest packs in the entire booster box were:
- 8.70g: AR
- 8.66g: SR
- 8.66g: AR
- 8.63g: AR
In this particular booster box, all four contained either an SR or an AR.
This is a strong tendency within this dataset.
However, only three AR cards were observed.
The fact that an SR and AR both appeared at 8.66g also shows that weight could not distinguish between those two rarity levels.
AR cards were concentrated toward the heavier end of this booster box, but another booster box may produce a different distribution.
RR Pack Weight
The RR cards observed in this booster box came from packs weighing:
- 8.53g
- 8.58g
- 8.61g
- 8.62g
Their average pack weight was approximately 8.59g.
RR cards therefore covered a relatively wide range from 8.53g to 8.62g.
The heaviest RR at 8.62g was only 0.01g lighter than the 8.63g AR pack.
At the other end, an RR appeared at only 8.53g.
Four packs weighed exactly 8.53g.
Only one contained an RR.
- 8.53g: RR — 1 pack
- 8.53g: No R or higher — 3 packs
The same pattern appeared at 8.58g.
- 8.58g: RR — 1 pack
- 8.58g: No R or higher — 1 pack
Therefore, no weight range unique to RR packs was identified.
R Pack Weight
The R cards observed in this booster box appeared at:
- 8.54g: 2 packs
- 8.56g: 1 pack
- 8.60g: 2 packs
- 8.61g: 1 pack
Their average pack weight was approximately 8.58g.
R cards therefore ranged from 8.54g to 8.61g.
Some appeared toward the lighter side of the distribution, while others appeared in relatively heavier packs.
At 8.61g, both an RR and an R were observed.
- 8.61g: RR
- 8.61g: R
Six packs also weighed 8.54g.
Only two contained an R.
- 8.54g: R — 2 packs
- 8.54g: No R or higher — 4 packs
Therefore, R packs could not be reliably identified using weight alone.
Packs With No R or Higher Rarity Observed
Fifteen of the 30 packs did not contain an SR, AR, RR, or R.
Their measured weights were:
- 8.47g: 1 pack
- 8.49g: 1 pack
- 8.50g: 1 pack
- 8.51g: 2 packs
- 8.53g: 3 packs
- 8.54g: 4 packs
- 8.56g: 1 pack
- 8.57g: 1 pack
- 8.58g: 1 pack
Their average weight was approximately 8.53g.
In this particular booster box, none of the five packs weighing 8.51g or less contained an R or higher rarity.
However, starting at 8.53g, higher-rarity results began to overlap with packs containing no R or higher.
An RR appeared at 8.53g.
R cards appeared at 8.54g and 8.56g.
Another RR appeared at 8.58g.
Therefore, the lighter end of this booster box showed a tendency toward standard results, but there was no universal weight threshold that could be applied to another booster box.
The Four Heaviest Packs Contained SR or AR
One of the strongest patterns in this test involved the four heaviest packs.
- 8.70g: AR
- 8.66g: SR
- 8.66g: AR
- 8.63g: AR
All four contained either an SR or an AR.
The next-heaviest pack, at 8.62g, contained an RR.
This means all five of the heaviest packs in this booster box contained an RR or higher rarity.
However, an SR also appeared at 8.59g.
Therefore, while the heaviest packs showed a strong tendency toward higher rarity in this particular box, not every SR or AR pack was located exclusively at the very top of the weight distribution.
The Same Weight Produced Different Results
Several identical displayed weights produced different opening results.
8.53g Results
- RR: 1 pack
- No R or higher: 3 packs
8.54g Results
- R: 2 packs
- No R or higher: 4 packs
8.56g Results
- R: 1 pack
- No R or higher: 1 pack
8.58g Results
- RR: 1 pack
- No R or higher: 1 pack
8.61g Results
- RR: 1 pack
- R: 1 pack
8.66g Results
- SR: 1 pack
- AR: 1 pack
Even when measuring to the nearest 0.01g, identical displayed weights produced different rarity results.
This demonstrates that pack weight may show a statistical relationship with opening results within a booster box, but it cannot be used as an exact identifier of the contents.
Results by Weight Range
The results can also be grouped into several approximate ranges.
✅8.63g–8.70g: SR and AR observed
All four packs observed in this range contained either an SR or an AR.
However, this result applies only to this specific booster box.
It should not be treated as a guaranteed SR or AR weight range.
✅8.59g–8.62g: SR, RR, and R results overlapped
An SR appeared at 8.59g, while R and RR cards also appeared within this range.
There was no clear weight boundary separating these results.
✅8.53g–8.58g: RR, R, and no-R-or-higher results overlapped
This range produced several different types of results.
Identical displayed weights produced both rarity hits and standard results.
✅8.47g–8.51g: No R or higher observed in this booster box
None of the five packs in this range contained an R or higher rarity.
However, this applies only to this one booster box and should not be assumed to apply to other boxes.
No packs in this booster box measured 8.52g, 8.55g, 8.64g, 8.65g, or between 8.67g and 8.69g.
Because no data exists for those measurements in this test, no conclusion can currently be drawn about those weight ranges.
Can Japanese Munikis Zero Packs Be Weighed to Identify Rarity?
The four heaviest packs in this booster box all contained an SR or AR.
The average weight of the SR and AR group was also higher than the RR, R, and no-R-or-higher groups.
However, the complete dataset also showed:
- An SR appeared at 8.59g rather than only at the heaviest end
- An SR and AR both appeared at 8.66g
- RR cards ranged widely from 8.53g to 8.62g
- An RR and no-R-or-higher results both appeared at 8.53g
- An RR and no-R-or-higher result both appeared at 8.58g
- An RR and R both appeared at 8.61g
- Factors other than card rarity may affect total pack weight
Based on these results, pack weight showed a noticeable relationship with rarity within this booster box, but it could not accurately distinguish SR, AR, RR, and R results.
The measurements published here should be viewed as data collected after fully opening one booster box, not as weight thresholds for selecting “hit packs.”
Summary of the Munikis Zero Pack Weight Test
After measuring and opening all 30 Japanese Munikis Zero packs, the main results were:
- The overall measured range was 8.47g–8.70g
- The average pack weight was approximately 8.57g
- The heaviest 8.70g pack contained an AR
- The four heaviest packs all contained either an SR or AR
- The five heaviest packs all contained an RR or higher rarity
- SR cards appeared at 8.59g and 8.66g
- AR cards appeared at 8.63g, 8.66g, and 8.70g
- RR cards appeared between 8.53g and 8.62g
- R cards appeared between 8.54g and 8.61g
- No R or higher rarity was observed in the five packs weighing 8.51g or less
- Several identical displayed weights produced different results
- Pack weight alone could not accurately identify rarity
- No MUR or SAR cards were observed in this booster box
This booster box showed a relatively strong tendency for SR and AR cards to appear among the heavier packs.
However, an SR also appeared at 8.59g, and several identical weights produced completely different opening results.
For that reason, the measurements are useful for comparing the distribution within this booster box, but they cannot be treated as fixed rarity thresholds.
This is the ninth pack-weight dataset published on the English version of tekemero.com.
I will continue measuring additional Japanese booster boxes under similar conditions and comparing whether the same weight patterns can be reproduced across different products and boxes.
