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

The Iron Flask Co-Pilot is a 40oz double-wall vacuum-insulated stainless-steel tumbler designed for all-day hot and cold beverage retention. It features a flip-cap lid with straw for leak-resistant sipping, fits standard cup holders, and comes in contemporary finishes like Dark Night. The 18/8 stainless construction resists dents and discoloration; the lid is reported leak-proof when sealed properly. Dishwasher-safe components and BPA-free materials appeal to everyday commuters and outdoor enthusiasts. Iron Flask positions this as a direct competitor to Owala and Simple Modern—strong insulation at a mid-range price (~$25). Community feedback highlights reliable ice retention and a practical, no-fuss design, though occasional reports of lid fitment variability and straw mold exist. Ideal for anyone seeking proven insulation without premium Stanley or Yeti pricing.