A BakuPack is a small plastic pouch, that is similar to booster packs from other TCGs. They contain one random Bakugan, one Gate Card and one Ability Card (Seen on the New Vestroia packaging).
The Gundalian Invaders BakuPacks contain Wave 1 Bakugan, such as Helix Dragonoid and Strikeflier. These were meant to get rid of excess Wave 1 Bakugan, and cost more than a regular BakuBoost.
Gundalian Invaders BakuPack
New Vestroia BakuPack