Double Wall Stainless Steel Flask. Double wall Stainless Steel insulation ● Vacuum flask ● Lid in Bamboo and Stainless Steel finishes ● Lid with a carry handle ● Comes individually packaged in a white presentation box. Product Size: 500ml. Box Size: 39.5(W) x 39.5(L) x 25(D)cm. Qty per box: 25. Material: Stainless Steel ● Bamboo