Heavy Containers were sold by the NBM team for $59.99. Each of them contains an Arcadium crystal which acts as a construction item and can be leveled up and sacrificed during fusions. Additionally, each pack contains other items, ranging from shop tickets to construction packs.
Overview of an Arcadium Crystal (left), and an Heavy Container (right). Arcadium crystals can be obtained by opening Arcadium capsules or Heavy Containers
The Heavy Container generally contains a higher quality crystal compared to the Arcadium Capsule.
Rarity
Arcadium Capsule
Heavy Container
Common
45%
20%
Rare
25%
30%
Epic
15%
25%
Legendary
14%
20%
Ultimate
1%
5%
However, the probability for the level of the crystal in each pack is similar:
Level
Arcadium Capsule
Heavy Container
1
45%
45%
2
25%
25%
3
15%
15%
4
10%
10%
5
5%
5%
Additionally, each container contains 10 Shop tickets along with an extra reward: