vacuum flask can keep the water warm for around 8hours feature: design: 350ml: NO./ctn:24pcs/ctn Measurement:47*31.5*23cm N./G.W.:7/8KGS 500ml: NO./ctn:24pcs/ctn Measurement:47*31.5*27.5cm N./G.W.:8/9KGS 1000ml: NO./ctn:24pcs/ctn Measurement:53.5*36.5*35.5cm N./G.W.:14/15KGS