I recently got the flip straw tumbler for my boyfriend since he needed something bigger for work. He takes it everywhere with him and tells me how the ice is still in there by the end of the day!!
I love my 40oz tumbler. I like having water with me wherever I go. I love the sturdy handle to carry. Only downfall, I didn't think through, my bad, is it's heavy to pickup and drink from. No fault to Stanley, just me.