I bought a 1200 calorie Mainstay Energy Bar to try out tomorrow. These are designed to be used as emergency rations. The label says that it's a balanced food product. Initial observations: The bar is vacuum-sealed in heavy duty foil packaging. The production date (02/16) and expiration date (02/21) are stamped on the back. It feels like very dense, like a brick. The packaging says that it contains three 400 calorie bars, and I can feel the separation between them through the packaging. I am wondering if the bars are already separated, or if I will have to break them apart. I have heard that these taste like lemon cookies. The manufacturer (Survivor Industries) says that Mainstay Bars won an emergency bar taste test conducted by Popular Mechanics. That contest was between ER Bars, Datrex, and Mainstay. I was under the impression that Mainstay had some sort of US Coast Guard/SOLAS certification for use as a life raft survival ration, but I don't see that on the product packaging or listed on the manufacturer website. In fact, the manufacturer website says that Mainstay bars are formulated for "land-based high stress situations." Datrex says their bars are USCG/SOLAS approved, and their bars also have a National Stock Number. Since I am land-based, and Mainstay won the taste test, I figured it was the right bar for me to try out. Here's the plan: tomorrow I'm going to have a 400 calorie bar at each meal. I won't eat anything else. 1200 calories is a little lean for a full day, but we'll see how far I get. Beverages will be water and black coffee.