We compared two classic stainless steel vacuum flasks: the Stanley Classic Legendary 1.0L and the Thermos Stainless King 1.2L.
What we looked at
Capacity, stated hot and cold times, lid and pouring, cleaning, and price.
The verdict
If you want the classic Stanley look, a stated 24-hour hot-or-cold claim, up to 5 days of cold with ice and dishwasher-safe parts, the Stanley Classic is the rugged pick, though it costs more and holds a little less. If you'd rather pay less for a larger 1.2L flask with a twist-and-pour stopper and a built-in cup, the Thermos Stainless King is the value option.
A 1.0L classic with a stated 24-hour hot-or-cold claim and up to 5 days cold with ice, but it costs more and holds less.
A bigger 1.2L flask with a twist-and-pour stopper at a lower price, but no ice claim or dishwasher note listed.
Stanley 1913 Classic Legendary Thermal Flask 1.0L (Hammertone Green) — Best Ice Retention
Intended for: Marketed as a 1 litre stainless steel vacuum flask stated to keep drinks hot or cold for 24 hours, with a leak-resistant wide-mouth lid that doubles as a cup and dishwasher-safe parts.
What we liked
- Stated to keep drinks hot or cold for 24 hours, and cold for up to 5 days with ice
- Leak-resistant lid and a wide mouth for easy filling and pouring
- Lid doubles as a cup
- BPA-free, and every piece is stated to be dishwasher safe
- Backed by the Stanley Built for Life promise since 1913
Worth knowing
- Costs more than the Thermos Stainless King on these listings
- Smaller at 1.0L, against the Thermos's 1.2L
Best for
- Campers, walkers and anglers who want a classic, rugged flask
- Anyone who wants a stated up-to-5-days ice-retention claim
- Buyers who want dishwasher-safe parts
Not ideal for
- Budget-conscious buyers
- Anyone who wants the larger 1.2L capacity
Thermos Stainless King Drinks Flask 1.2L (Midnight Blue) — Best Value
Intended for: Marketed as a 1.2 litre stainless steel vacuum flask stated to keep drinks hot for 24 hours and cold for 24 hours, with a built-in serving cup and a twist-and-pour stopper.
What we liked
- Cheaper than the Stanley Classic on these listings
- Larger 1.2L capacity
- Stated to stay hot for 24 hours and cold for 24 hours
- Stainless steel inside and out, with a built-in serving cup
- Twist-and-pour stopper so you can pour without removing the lid
Worth knowing
- No ice-retention claim beyond 24 hours in the listing
- The listing highlights don't mention dishwasher safety
Best for
- Budget-conscious buyers who want a bigger flask
- Anyone who likes a twist-and-pour stopper
- Day-trippers and commuters who need a large hot-drink flask
Not ideal for
- Anyone who wants a stated multi-day ice claim
- Buyers who want a listed dishwasher-safe flask
