For our original 500ml and 600ml bottles, we use only the highest quality food-grade 18/8 stainless steel metals. The bottle retains no odour, and come with our innovative EasyTwist lid so you don’t have to turn the lid more than once to get to your water. Our insulated 500ml and 700ml bottles are entirely made from medical-grade stainless steel - highest quality stainless steel and naturally BPA-free. They keep drinks cold for up to 24 hours and hot for 12 hours, come with an easy to carry lid and a soft-grip base to ensure the bottle doesn't easily slip on tables.We also use an extra dose of joy. So, every time you drink out of your GiveMeTap bottle, you get a little happier!