When we introduced the Thinkbaby line of baby bottles, 95% of the baby bottles on the market were made of polycarbonate which contains BPA. Initially, we attempted to convince the major companies to move off of polycarbonate, but after being unsuccessful we launched Thinkbaby and Thinksport to address the concern of chemicals leaching from consumer products. We started with the baby bottle because polycarbonate was ubiquitous across the industry. As little ones systems are still in a state of development they have very little defense against foreign chemicals therefore, all of our bottles are free of - Bisphenol-A (BPA), phthalates, nitrosamines, lead, PVC, PET, and biologically harmful chemicals. Our stainless steel baby bottle has become one of our most popular items. We built the Thinkbaby stainless steel bottle with extra soft silicone nipples, making for easy transition from nipple to bottle. This is a struggle that most parents face in moving to the next stage of feeding. The base of the bottle is made of medical grade (18/8) stainless steel and has markings on the inside and outside to indicate volume.