The Trekk 2-in-1 Tumbler is a versatile 350ml vessel that also functions as a cooler for glass bottles. This innovative product features a built-in bottle opener on the base for added convenience. It comes with two interchangeable lids, allowing for easy conversion from a tumbler to a cooler. The cooler lid is designed with a silicone rim to securely grip the glass bottle. The tumbler is constructed with a double-walled and vacuum-insulated design. This ensures that your coffee or tea remains warm for extended periods, while also keeping glass bottles cool for hours. Available in either blue or black.