Stanley has made the definitive thermos since 1913 — the classic vacuum flask keeps drinks hot for 24 hours in real conditions rather than lab tests, and the lifetime warranty is one of the most generous in the industry. Virtually indestructible stainless steel construction means the only way this flask fails is if you deliberately destroy it. The size is right, the pour lid doubles as a cup, and the weight is reasonable for what you get. If you've seen a construction site, you've seen this flask.
Hydro Flask's TempShield insulation keeps ice water cold for 24 hours and hot drinks hot for 12 in genuine outdoor conditions. The wide mouth fits ice cubes without funnelling and is wide enough to clean properly with a bottle brush. The powder coat finish is more durable than painted alternatives and the colour range is extensive. The lifetime warranty is comprehensive. The flask for people who want better performance than Stanley at a price that's still rational.
Pewter holds the flavour of spirits more neutrally than stainless steel — there's no metallic taint, which matters when you're sharing a good whisky on a shoot or a walk. This hand-crafted flask comes with a funnel which sounds small but matters enormously when you're filling it from a bottle in the field, and the leather carry case keeps it protected and accessible. The flask you bring out for special occasions rather than every gym session.