The traditional rubber hot water bottle in red has a 2.5 liter capacity. The larger size of the hot water bottle provides long lasting heat and covers a much larger area than the average hot water bottle . These hot water bottles have a brass thread construction to keep the bottle leak free. Both sides have a cross hatched design. Made in Germany. Great for aches, pains, strains, arthritis, cramps, stress reduction, cold feet, keeping warm and so much more! Made in Germany.