An integration that would be foolish to not take seriously

With the adoption of the BMP-3 in 1987 by the Soviet Army, the vehicle featured many improvements and integrations that set it apart from its predecessors. A new combat module with a paired weapon system consisting of an autoloaded 100mm cannon and a 30mm autocannon. Several onboard systems added more combat capabilities to the vehicle. One of the newly installed onboard systems was a toilet. 

The toilet is located under the left seat in the rear troop compartment. Using the toilet is relatively straightforward, a bag with chemicals would be placed inside of the container and after usage disposed of. 

It is important to note that a vehicle deployed in a march or active combat should have onboard features that comfort its crew. 

After developing the BMP-3, Kurganmashzavod has been working on the Kurganets-25. An IFV is meant to replace older generations of IFVs currently serving in the armed forces. 

The Kurganets-25 is similar to the BMP-3. Utilizes a centrally-mounted combat module and a troop compartment at the rear of the hull. It differs from the BMP-3 in that the engine bay is mounted at the front of the vehicle. However, the BMP-3 has retained a feature that prioritises crew comfort.

"Combat Approved" claims this feature is for crew performing autonomous missions without returning to a local base of operation. 

A basic folding design is located in the rear hatch. The entire contraption unfolds. The toilet also has a cushion, a massive upgrade over the BMP-3 toilet design. It is unknown where the waste is disposed of after usage since there is no container or mounting bracket. 

Installing toilets in tanks is a revolutionary approach to crew comfort! 

A sense of humour is the ability to understand a joke - and that the joke is oneself. 

References: "Combat Approved" - ENG channel