Any of the lids with an open drink area are going to just pour out if you have a straw in. You can take the straw out and close the ozark trail chair tab, which will help. It’s worth noting that the Ironflask does not have that capability. Ozark Trail tumblers are not dishwasher safe… Continue reading Ozark Trail® 30oz Pink Vacuum-Insulated Stainless Steel Tumbler