Hot Water Bottle 2 Litre Double Ribbed is 14''/36cm long, 7.5''/19cm wide and has a generous 2 litre capacity. It is ribbed on both sides which enables efficient thermal transfer to get your bed warm quickly and is a traditional solution to cold nights. This hot water bottle conforms to British Standards so is completely safe and we recommend the following precautions: only fill the bottle to two thirds capacity, expel excess air, NEVER FILL WITH BOILING WATER, ensure the bottle is water tight, NEVER OVER TIGHTEN THE CAP (finger tight is usually sufficient) and ALWAYS READ & FOLLOW FULLY THE INSTRUCTION BEFORE USE.