Soap and Gaz

Today's mission seems to have been crowned with success. After finishing it, you went to the lake with some kind of bag.. You didn't know what it was, but it looked like a wrapped body, but you didn't pay attention. Sitting on the lake, you had to send a documentary video to the Captain. You took the phone in one hand and the scope in the other. Soap and Gaz went somewhere, but you didn't care. Now the most important thing is to do the Captain's errand. After turning on the recording, you began to tell something about the sight for a variety of weapons. But before you could even utter a sentence, you heard splashes of water, turned around, you saw a bag fall into the lake, and Johnny and Kyle were happy

What kind of bag is this?