Ven Ghan. They contain portable wormholes which are also linked to containers to detain other things once trapped inside. One of these capsules defeated Miles Dredd and also was going to suck Max Steel in Turbo Flight Mode. The Containment Capsules' first appearance are in Ultralink Invasion Part One.
They are a little capsule with black and yellow collors. When it is about to explode, it flashes a light before releasing a portal singularity.