Non-store packs - can we get a hint please?

In the HIT store, packs clearly lay out how many cards are in them, along with odds of getting particular values. 

In the Sets packs, are we just supposed to throw collectibles at them, and hope for the best? How exactly does the “XP S2 Base Pack” (1 collectible cost) differ from the “XP S2 Legendary Pack” (60 cost)? Are there 59 more cards? Higher card values? 

While getting the odds are a long shot, can we at least get a small note about what these non-monetary packs contain (and any ‘guaranteed’ pulls)? 

And on that note, for choice packs, can we get a “(X of Y)”? I found out the hard way the CN 87 BND was 1 of 2 (and not all 5).