Promotional Black+Blum Explorer Flask Duo 1L This 1L vacuum insulated stainless steel flask is built for every kind of adventure—whether you're heading out on the trail, relaxing at the beach, or tackling the slopes. With its reinforced structure and durable design, it keeps drinks piping hot or ice cold for up to 24 hours. Completely leak proof, it features a steel cap lid with an easy pouring mechanism and two double-walled stainless steel cups for sharing. The wide-based cups offer extra stability on uneven ground, while a thick nylon strap makes it easy to carry or pour. A silicone gasket prevents drips when the cups are stored, and the flask is dishwasher-safe once the strap is removed.