The items in the game are stored in containers outside of buildings to protect them. If cargo like goods drop out of a glider, a container will be thrown on the ground, which can again be picked up by another glider.
Containers can be found around the sectors at predifined places from the start of the game. They can contain goods or energy crystals. They glow white if a good is inside and blue if crystals are. At random times and random places, containers will continue to spawn around the sector.