Rechargeable Hot Water Bag Bottle with Flannel Cover Thermal Water Bottle Thicken Heat Bag Hot Water BagFeature:Used safe non-toxic graphene heatsed,constant temperature and not so hot,no need to fill water can keep warm for long time.Powered by usb,3 adjustable heat temperature, one minute heat up quickly.With soft flannel cover,soft breathable,high elascity,can extend the heat preservation time.Universal USB interface, can be used anytime, anywhere.Washable and foldable portable design,highly sealed,easy to carry to anywhere,2 colors for you choice.Specification:Material:Safe graphene,soft flannel cover.Size:Size-30x19cm/11.8x7.5 inchWeight:165gColor:Grey,GreenPackage Include:1xCartoon Hot Water BottleNote:1.There might be 1-2cm deviation by manual measurement.2.Due to the light and screen setting difference,the item's color may be slightly different from the picture