I've been getting Mama the Yeti Rambler 20 oz Tumbler with MagSlider Lid to accommodate her wish to keep iced water handy.
Yes they cost too much and yes they take too long to personalize but I have specific tastes which mark the way I am and these cascade to my choices for others.
I prefer them over her old Contico tumblers because the Yeti product is dishwasher safe whereas the Contico tumbler had a dishwasher safe lid and that was it.
She is amassing a small collection of these so some may be washed while others used.
She fills them with ice and water and the thermal construction retains that coolness she craves in her beverage ...