The YETI Rambler? Available in 18 oz (532 ml), 26 oz (769 ml) and 36 oz (1065 ml). There are Bottles to cover most situations, from a quick afternoon hike, wetting a line or an overnight expedition. The Rambler bottles are available in three colours (stainless, brick red or black). The Rambler is personal, rugged, and ready for almost anything, the Rambler water bottle is the perfect addition to any adventure.