A pre release pack is sold only during the launch period. It includes five draft boosters, a random foil card(with some indication of the launch event), and some other things (like a d20 modified to count lives rather than be rolled randomly, and a code for five packs in Magic Arena ) it is small and the box can be used to store a deck. (Oh, and only is available in localized languages outside the US)
A bundle is a bigger package with ten draft boosters, some lands (half of them are foil) a fixed foul card, a dice life counter (that isn't exactly the same as the ones in pre-release packs, it can be a different color with a different symbol or otherwise the same just bigger) and it is made of a sturdy material that can be used to store cards.
A draft booster box includes 36 booster packs, and sometimes a bonus card.(again fixed, but it tends to be something desirable)
A draft booster includes 15 cards (1 is normally a land, 1 rare/mythic, 3 uncommons, and ten commons) and an additional card that sometimes is a token.
There are also set boosters, these have a more varied content not suitable for sealed play(a highlight is that you can possibly get cards from an special list). The box of set boosters tends to retail for more or less the same that a draft booster box, but it has only 24 booster packs.
