Iron Flask Co-Pilot 40oz Insulated Tumbler with Flip Cap & Straw

The Iron Flask Co-Pilot is a 40oz vacuum-insulated stainless-steel tumbler with double-wall insulation designed for all-day cold and hot retention. It features a flip-cap lid and included straw, a cup-holder-friendly base, and is constructed from 18/8 stainless steel for durability. The tumbler is leak-proof when properly sealed and includes both sip styles (straw and direct drink). Dishwasher safe components make cleaning convenient. At $18.98 (Prime-exclusive pricing), it delivers strong value for the category—comparable performance to tumblers costing $25–35. Iron Flask has built solid reputation for insulated drinkware without premium pricing. Suited for commuters, office workers, outdoor enthusiasts, and anyone seeking reliable all-day hydration. Minor reports of occasional condensation and straw cleaning challenges are typical for the category.