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The sandbag's purpose was to make the sandbag wall, and I didn't want it flat on the bottom. To print it, you could shift the model down into the bed (z-direction). Using Cura this prints the bottom of the sand bag flat. Or use supports.

As to the single barrels and crates being rotated, I forgot to rotate them before I saved them individually and I wanted to release them. They do have a "Flat side". Or use supports.