1.Capacity:500ml 2.high vacuum insulated structure 3.custom logo&color is welcome 4.can ... walls stainless steel 3042.Double walls stainless steel and high vacuum make it insulated from outside,can keep warm or cold ... ,stainless steel vacuum cup,tour flask,wide mouth flask,student flask,sports bottle,etc.Expectting for our cooperation! new 350-500ml double walls stainless steel thermos vacuum flask