On a
Boler, the long thin banana piece is used to keep the top bunk at a slant when it`s down and to shorten the depth of the bottom cushion from your knees to your butt when you`re sitting on it and is wider for use for sleeping when the top bunk is up.... and the slant, so it`s more comfortable to lean back on as opposed to being 90 degrees to the cushion when sitting.....Benny