ULTRA-DURABLE MUGS SIZED FOR STRONG BREWS AND PERFECT POURS. The Rambler® 177 ml Stackable Mugs are just the right size for a flat white on the deck and a cortado at camp. Plus, its DuraSip™™ Ceramic Lining, over-engineered firm-grip handle, and stackability make it ideal for espresso machines, camp kitchens, and beyond. Size: 177 ml / 6 oz