I open 90 packs and i get 7 Minato frags, it is ~=130 coupon per frag, it's not bad

The absolute mininum for 85 packs is 85 points, if you get only rice Onigiri, maximum is 425, if by some miracle you only get Panda. I don't know the exact Ratios, but through the free 15 I've gotten 1 Panda, 6 Salmon, 8 Rice.

It's just easier (but longer) to wait a bit longer, this event's unreliable with pricing. But I'm pretty sure 85 will be something like 5-10 Panda, which'd be good, and then sorta cut 40-60 between salmon-panda.

Points per Onigiri

-----------------------------------

Rice-1

Salmon-3

Panda-5

78 Food Sacks gave 141 points .. based on my 2nd Main Account .. (been targeting atleast 170 points to get 10pcs of SoL Cloth)