Sea to Summit
Sea to Summit Horizon Insulated Mug (475 ml, double-wall polypropylene)
- Weight for its size: 6/10 How much it adds to your pack for the amount it holds.
- Cooking and ease of use: 5/10 How evenly it heats, whether food sticks or burns, cleaning, and the handles, lid, pouring and steadiness on a small stove.
Lowest price we found
£13.99 at Ultralight Outdoor Gear
Go to Ultralight Outdoor Gear Compare 2 shopsHot drinks at camp that stay warm longer than in a single-wall mug
- Type
- Mug
- Capacity
- 0.475 L
- Weight
- 106 g
- Material
- Glass-reinforced polypropylene, double wall, with a press-fit sipping lid
Where to buy
Ultralight Outdoor Gear £13.99 In stock. Its page gives 106 g. Free UK delivery on orders over £15; under that, the shop shows the charge at checkout.
View at shop: Ultralight Outdoor GearSea to Summit £14 In stock. Delivery £4.50. £4.50 delivery under £75, free over £75. Red, green or grey.
View at shop: Sea to SummitPrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Weight for its size
From maker's figures 6/10How much it adds to your pack for the amount it holds. 6: A bit better than average.
Sea to Summit's pages disagree. Its US, Australian and EU pages give 105.7 g (no volume), and its UK feature list gives 475 ml; Basecamp Shop also lists 105.7 g and 475 ml, and Ultralight Outdoor Gear gives 106 g (and 400 ml). We band 105.7 g for 475 ml: 223 g per litre, in the 220-299 g/L band. The UK spec box (74 g and 335 ml) sits under the subtitle "Passage Cup" and matches Sea to Summit's separate Passage Cup (74 g, 355 ml in other shops' listings), so it looks pasted from that product. Read as it stands it is 221 g per litre, and 106 g for 400 ml is 265 g per litre: both the same band.
Cooking and ease of use
Estimate from maker's specs: what it is made of 5/10How evenly it heats, whether food sticks or burns, cleaning, and the handles, lid, pouring and steadiness on a small stove. 5: Does the job. Average for wild-camping gear.
Estimate from maker's specs
In short
Good for
- Hot drinks at camp that stay warm longer than in a single-wall mug
- Drinking without a handle: the fluted sides stay comfortable to hold
- Measuring water for meals with the scale moulded inside
Strengths
- Double-wall construction to keep drinks warm (Sea to Summit)
- Cool Grip fluted sides and base, and a self-draining press-fit sipping lid
- Graded volume scale inside
- Sea to Summit says it is microwave and dishwasher safe
Weaknesses
- 106 g is not light for 475 ml (223 g per litre)
- No independent review found yet
- Plastic mug for drinks only: not for use on a stove or fire
- Sea to Summit's pages disagree on weight (74 g or 105.7 g) and size (335 or 475 ml)
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.