MEDIUM SIZE SHOWN IN PICTURES. - Tumblers are 24 oz / 750 ml wide mouth mason jars, they include a straw lid, mason jar ring, and BPA Free plastic straw.  The tumblers are hot, cold, and dishwasher safe!  WHY USE A GLASS MASON JAR? “GLASS is FIRST CLASS”! At Mason Jar Merchant, we believe swappin’ plastic for glass is the best way to start your low-waste journey.   Like your glorious and dreamy TROPICAL get-away: CLEAN SHORES & ZERO WASTE! -Earth-friendly and sustainable alternative to reusable plastic water bottles -Endlessly recyclable and surprisingly durable HEALTHIER BODIES & NATURAL TASTE!