Blue Bottle Coffee Travel Mug Purchase Price: ¥4,870 The "Travel Mug" is a stainless steel tumbler made in collaboration with MiiR, based in Seattle. It has excellent heat and cold retention thanks to its double-wall vacuum insulation. Recommended for outdoor activities like camping and travel, as well as for everyday use as a coffee cup in the office or at home. Capacity: 350ml ＜Materials and Features＞ ・Double-wall vacuum insulation ・BPA-free press-in lid for long-lasting heat and cold retention ・Made of 18/8 medical-grade stainless steel that doesn't impart metallic odors or tastes ・Non-toxic and safe HardShell™ powder coat paint ・Stackable