Are there any other metals used besides copper to make this bottle? Nope. This bottle is made from 100% of the purest copper available, to ensure you receive the best product on the market! Is the copper coated with anything? For your safety, there's a thin coating of food grade lacquer on the outside of the bottle. On the Inside, there's nothing. Our aim is to keep your bottles as pure and natural as we possibly can. Is this bottle dishwasher safe? Due to this being 100% pure copper, it is NOT dishwasher friendly. How comfortable is this bottle to carry This bottle is a delight to carry around. It's big enough to carry a good amount of water, but practical enough to fit in the majority of bags and backpacks. Is this bottle leak proof? Will it spill in my backpack? Yes. Tried and tested, this bottle is completely leak proof! Make sure you correctly tighten the lid after use, and you will never spill a drop! Is the opening big enough to put ice inside the bottle? Absolutely, your bottle is big enough to fit whole ice cubes inside. However, this bottle gets so cold, so quickly, it's doubtful you'll even need any! Can I put hot drinks in my bottle? We don't recommend putting hot drinks in this bottle, due to how quickly this high-grade copper takes on the temperature of its contents. Obviously you can put any liquid inside, but unless you want to burn your hands, we recommend you stick to the beverages that are meant to be enjoyed super cold! Is the bottle insulated? No. For maximum conductivity, the bottle is made from 100% pure copper. Care Tips: * Try to clean these bottles by hand. Avoid dishwasher as the detergent can cause oxidation leading to permanent damage. * Use lemon juice or tamarind to rub the utensils. Vinegar can be also used in place of Lemon. Leave it for few minutes and wash with water. * Use liquid soap and rinse in hot water. Use a soft washing cloth to clean the bottle.