ONEVER 2L Stainless Steel Thermal Flask

The ONEVER 2L stainless steel thermal flask is a large-capacity vacuum-insulated bottle with a screw cap, carry handle and claimed adjustable shoulder strap. Its size suits carrying drinks for longer outings, while its listed weight and footprint are worth considering when packing it.

At a glance

The 2-litre capacity is intended to reduce the need for frequent refills.
The listing claims a six-layer vacuum insulation structure and retention of cold drinks for up to 24 hours and hot drinks for up to 12 hours.
A wide mouth is described as convenient for filling and cleaning, including adding ice.
The listing describes a carry handle and adjustable shoulder strap for transport.

Price

£20.39Save 15%

Reference price: ~~£23.99~~

Price checked: 14 Nov 2026

View offer Ahead of Black FridayExplore the selection

Pros and cons

Pros

Large 2-litre capacity for carrying multiple servings.
Screw cap and vacuum-insulated stainless steel construction are specified.
Listed dimensions and weight help assess whether its size suits your bag or outing.

Cons

Not dishwasher safe, according to the listing.
The 2-litre capacity and listed 500-gram weight make it a substantial bottle to carry when full.

Technical specifications

16 specifications

Identity
Brand	ONEVER
Model	2l Large Stainless Steel Thermal Flask

Capacity and construction
Capacity	2 litres
Material	Stainless Steel
Insulation	Vacuum Insulated
Colour	Black
Pattern	Solid
Cap type	Screw Cap
Lid	Yes

Dimensions and care
Dimensions (W × H)	15W x 31.8H centimetres
Base diameter	10 Centimetres
Weight listed	500 Grams
Dishwasher safe	No

Use and origin
Recommended use	Hot Drinks
Age range	Adult
Country of origin	China

What to know before buying

The claimed hot and cold retention times are listing figures, not independently established performance. Customer feedback is mixed on how long drinks stay warm, so temperature retention may matter for your intended use.

What’s in the box

Included

Water bottle

Who is it for?

A good fit for

People who want to carry a large supply of hot or cold drinks for work or outdoor activities.
Buyers who value a wide-mouth bottle and a carry handle for filling and transport.

Less suited to

Anyone who needs a dishwasher-safe bottle.
Buyers seeking a compact, low-capacity flask.

ONEVER 2L Stainless Steel Thermal Flask · photo 2 — Additional product photo 2

Customer reviews on Amazon

3.9 / 5 · 146 ratings

5 stars63%63%
4 stars8%8%
3 stars10%10%
2 stars1%1%
1 star18%18%

Customer feedback describes the thermos as good quality, while reports about temperature retention are mixed: some say drinks stay hot all day and others say warmth is lost by teatime. This matters if you expect the claimed hot-retention period to cover a full day. The overall rating distribution is mixed, so it does not establish consistent performance for every buyer.

Positive themes

Customers describe the thermos as good quality.

Mixed feedback

Temperature retention receives mixed feedback, with reports ranging from drinks staying hot all day to warmth fading by teatime.

Frequently asked questions

How much does the ONEVER flask hold?

The listed capacity is 2 litres.

How long does it claim to keep drinks hot or cold?

The listing claims up to 12 hours for hot drinks and up to 24 hours for cold drinks. Customer feedback reports mixed warmth retention, so treat these as claims rather than guaranteed results.

Can it go in the dishwasher?

No. The listing says it is not dishwasher safe.

What comes in the package?

The included-components field lists one water bottle. A carry handle and adjustable shoulder strap are described in the feature text, but the package list does not confirm the strap as a separate included item.