While often questions pop up about the size of ordinary Sandsäcke (Sandbags), I attach some pics of German Sandsäcke. in 2019, there was a promotional action of the THW to get new members. THW or Technisches Hilfswerk is a disater relief organisation here in Germany. I was called Sandsack Challenge and happened in many cities allover Germany.
As a scale, the pallet underneath the bags is 1200mm by 800mm or 48 inch by 32 inch.