To give out ballast, sandbags are not dropped, on empty them. Theres is a handle on the bottom of the bag, to keep it. There are eyes on the top of the sandbag for the string connecting the bag with a hook.
The picture above shows the emptying of a sandbag. The sand is falling towards the earth.
In English, the bag, which hangs outside the basket and from which the sand is delivered in small quantities with a shovel, is also called a sand bag.