Black+Blum Explorer Flask Duo is a 1-litre vacuum-insulated stainless steel flask designed for outdoor use – whether you are hiking in the mountains, on the beach, or on the slopes. The vacuum insulation keeps drinks hot for up to 24 hours, or ice cold for 24 hours.

The flask comes with two double-walled steel cups that screw onto the top and bottom, so you can easily share a warm drink with a companion. Each cup holds 200 ml and is completely free from plastic. The robust nylon strap makes the flask easy to carry and also acts as a support when pouring. The stopper features a pour spout that reduces spills and retains heat for longer.

The design has a timeless, sturdy appearance with a ribbed steel body, built to withstand rough use over time.

Technical specifications: Capacity: 1 litre Materials: 304/18-8 stainless steel, silicone, nylon, polypropylene Insulation: Vacuum-insulated (24 hours hot / 24 hours cold) Included: 2 double-walled steel cups of 200 ml each + nylon carry strap Lid: Stopper with pour spout, steel-lined interior and silicone seal Leakproof: Yes, 100% leakproof BPA-free: Yes Dishwasher safe: Yes (remove strap first) Weight: 745 g Dimensions: 9.7 × 25.8 cm Warranty: Lifetime guarantee