Small Grey Water Tank (2.5g)

This small 2.5g water container is used for our grey water that is under our sink and sits behind our toilet.  We have to empty it once a day.  Our fresh water containers are stored under our passenger side seat bench. We have 4- 6 gallon water containers that we store our fresh water in. They measure 10x11x16. Our original plan was to use the white 5g container, however, we couldn’t get the water to flow all the way back to the back so now we only have this 1 2.5g one that drops straight down.  I thought it would be a pain to empty it, but it hasn’t been a problem at all.  It’s easy.