YETI. RAMBLER 18OZ BOTTLE. NAVY. The Rambler 18 oz. Bottle is a necessary addition to your day hikes kayak trips and daily commutes. This tough bottle is double-wall vacuum insulated to keep your water cold or coffee hot until the last sip and comes with a TripleHaul Cap. Separate your Rambler from the herd -- Rambler Bottles are available in stainless and DuraCoat Colors that won t fade peel or crack.