The Rambler® Hotshot Cap. On-the-go caffeine enthusiasts, meet the insulated, 360-drinking, 100% leakproof cap ideal for morning commutes, cold-weather hunts, night shifts, and beyond. With just a half twist and a click, you can sip from any side and enjoy that perfect, piping-hot temp. And as an added bonus, you can put the HotShot™ Cap on any of our Rambler Bottles – it’s compatible with all of ‘em. But if you ask us, the 12 oz. and 18 oz. are the perfect sizes for it.