Ice that melts before lunch is a problem solved with thick stainless steel.
Why Not Just Buy the Cheap One?
Cheap vacuum-insulated bottles ($10–$15) use thin walls that dent easily and lose temperature in a few hours. Yeti's 18/8 stainless steel is double-wall vacuum insulated with a No Sweat design; ice stays frozen for 24+ hours, and the bottle survives drops that would destroy the cheap ones.
The Buy-Once Math
You'll replace a cheap bottle every year because the vacuum seal fails or the cap cracks—$12×4 = $48 in 4 years for warm water. The $40 Yeti lasts decades, keeps drinks cold through a workday or hike, and never leaves you with lukewarm disappointment.