But let's be honest, if it wasn't such a drag to get them, everybody would go for the biggest one, because the extra space can always come in handy.
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All you need to do it to make way to upgrade packs on way without loosing zcoins
10slot bag + 4 zoins -> 15 slot
15slot bag + 10 zoins -> 20 slot
Or refund zoins from pack (so you can get 10 slot pack and when you get another 4 you can refund your 10 slot pack for zoins)
That way smaller packs are relevant. And excessive 20 slot pack grind is solved and made nonissue by having two milestones along the way.