The following is an excerpt from the updated US Army "Sniper Training" Field Manual 23-10, chapter 4, section 11: Occupation of Sniper Firing Positions.
Knowing how to shit in an MRE bag while prone is essential to the modern sniper’s mission. Contamination of a hide site with the olfactory cataclysm that is an MRE shit is unacceptable and should be avoided at all cost. Fortunately, the source of the problem is often part of the solution. MRE bags are great for shitting in.
