The first difference is their capacity. The Stanley tumbler comes in 16- and 20-ounce sizes, while YETI comes in 10-, 20- and 30-ounce sizes. The second difference is the color options.

Stanley Quencher Tumbler 40 oz for $34, instead of $45 Stanley Quencher Tumbler 30 oz for $27, instead of $35 Yeti Rambler 42 oz Tumbler for $36, instead of $45 Yeti Rambler 30 oz Tumbler for $38 ...