Bulk cruisers are a class of medium-sized spaceships larger than small craft like Airspeeders and TIE fighters and smaller than large ships like Asteroid ships. They can and do land on planets, which they do using gravity-control tech. They mostly travel through the local solar system with nuclear-rocket engines, and some bulk cruisers are equipped with Hyperdrive permitting faster-than-light interstellar travel.
Bulk cruisers are most often used as civilian vessels carrying cargo and passengers, although some are used for law enforcement or military defense. Bulk cruisers tend to be 100 to 500 feet long. A bulk cruiser might carry one or more smaller craft.