Amazon.com Review:

Thoroughly modern in form and function, Bodum's Canteen drinkware puts a new twist on glassmaking. The walls of each vessel are actually two layers of clear borosilicate glass, creating an optical illusion that the liquid is suspended inside. Used for scientific lab equipment, borosilicate is exceptionally strong, lightweight, and thermal-so it's well suited to meet everyday dining demands. Winner of the prestigious European IF Design, Canteen's shapes are cut in slightly tapered, clean lines for an almost futuristic effect at the table or bar. They also go safely into the dishwasher and microwave. Because the glasses are mouth blown, each one may have slight variations. The inner wall should be protected from sharp or heavy objects.