Sport bottle: 1:Double -wall,BPA free,non-toxic,lacquer. 2:SGS,FDA approval. 3:Various styles ... :300ml,500ml,600ml,750ml.stainless steel sport bottle is double-walled and sport bottle is used mainly in company,house,university,hospital ... ect.drinking sport bottle configuration:seamless fabric,durability bottle.unbreakable to fit into any rucksack ,leather pouch ...