Details & Specifications It’s the flask that never lets you down—unless of course, it’s empty. The retro look, portable size, and slim silhouette means that it can slip seamlessly into any situation. There’s a wide mouth opening for easy refills (no funnel needed). And the stainless steel construction with leakproof cap makes it extra durable. Classic Series 18/8 stainless steel, BPA-free Leakproof + packable Never-lose cap with wide mouth opening Weight: 0.17 kg Dimensions: 80 x 40 x 193 in.