GSI Outdoors
GSI Outdoors Infinity Backpacker Mug (500 ml, with lid and sleeve)
- Weight for its size: 7/10 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.
Hot drinks at camp for one person, and a bowl for porridge or a freeze-dried meal (500 ml)
- Type
- Mug
- Capacity
- 0.503 L
- Weight
- 99 g
- Material
- BPA-free polypropylene mug and lid; foam sleeve with rPET cloth cover and webbing handle
Where to buy
Wood To Water £15 In stock. Delivery £6. £6 UK mainland delivery, free over £80. Its page gives 136 g and 500 ml.
View at shop: Wood To WaterUltralight Outdoor Gear £15.99 In stock. Free delivery. Free tracked UK delivery. Its page gives 102 g and 500 ml. Its text also mentions 550 ml.
View at shop: Ultralight Outdoor GearPrices 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 7/10How much it adds to your pack for the amount it holds. 7: Better than most.
GSI's US page gives 99 g for the mug, lid and sleeve and 503 ml in its specification line (converted from US units). 99 g for 0.503 L is 197 g per litre, in the 150-219 g/L band. The same page's text gives 517 ml (192 g per litre, also band 4); we band the lower capacity. Shops: Ultralight Outdoor Gear 102 g and 500 ml (its text also says 550 ml), Wood To Water 136 g and 500 ml (273 g per litre, band 3; GSI doesn't give that figure).
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 for one person, and a bowl for porridge or a freeze-dried meal (500 ml)
- Measuring water for rehydrating meals (markings up to 400 ml, read from inside)
- Walkers who want a light mug with a lid and a handle that folds flat
Strengths
- 99 g for 503 ml, 197 g per litre (GSI)
- Sealable sip lid, foam sleeve to hold hot drinks, non-slip base and webbing handle that folds flat (GSI)
- Measuring marks in ml and cups on the inside (GSI; Three Points of the Compass on the older mug)
- Lifetime warranty against material and workmanship defects (GSI)
Weaknesses
- No hands-on review covers today's version: the write-ups we found all tested older mugs with a neoprene sleeve
- Insulation is modest: a better-insulated mug keeps drinks hot longer (older mugs: GearJunkie, Three Points of the Compass)
- Not spill-proof in a pack: steam pressure can lift the press-fit lid (Ultralight Nerd, older mug)
- Polypropylene holds food smells; mice chew the plastic (Ultralight Nerd, GearJunkie, older mugs)
- Doesn't nest inside a typical cook pot (PopUpBackpacker, older mug)
- Lid is tight to remove and has crevices that catch food (Three Points of the Compass, older mug)
- UK shops disagree on weight: 102 g to 136 g
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (5)
- GSI Outdoors: Infinity Backpacker Mug (US site; 99 g, 503 ml in the specifications and 517 ml in the text, converted from US units; part 75285 black)
- GearJunkie: GSI Outdoors Infinity Backpacker Mug (Sean McCoy; one older mug used for ten years; the page is dated 19 Jun 2026 and says it was first written in 2019)
- Ultralight Nerd: GSI Outdoors Infinity Backpacker Mug long-term review (over five years; an older mug with a neoprene sleeve)
- PopUpBackpacker: GSI Infinity Backpacker's Mug 5-year review (Nick Gatel; bought about 2020, so an older mug; the page's closing summary reads as machine-written and isn't used)
- Three Points of the Compass: Gear talk, GSI Infinity Backpacker Mug (tried on trails; the earlier 500 ml version, not the newer one)