Even though both claim to be leak-proof tumblers, I held both upside down and they both leaked a lot! Because of the handle, for example, you won’t be able to put them into the side pockets of a backpack either. The design is very sleek with a thicker top and ozark trail backpack narrow bottom.… Continue reading USA Ozark Trail Double-Wall, Vacuum-Sealed Tumbler Stainless Steel 20oz 590ml