Nalgene Wide Mouth Ultralite Bottle (32 oz) Review

Overview

The Nalgene Wide Mouth Ultralite is the lightweight sibling of the ubiquitous clear Nalgene — same familiar shape and 63mm wide-mouth threading, but built from HDPE instead of Tritan, which trims the weight from roughly 170g down to 106g. The Ultralite is up to 40% lighter than the clear Nalgene. It sits in a middle ground most ultralight hikers know well: heavier than a disposable PETE bottle, but meaningfully more capable in cold weather and with certain filter systems. This is a bottle with a specific job, and it does that job well.

Key Specs

Spec	Value
Weight	106 g (3.7 oz)
Capacity	32 oz / 946 mL
Material	HDPE
Body Diameter	3.5 in
Cap Diameter	2.5 in (63mm wide mouth)
BPA/BPS Free	Yes
Dishwasher Safe	Yes
Freeze Safe	Yes
Origin	Manufactured in USA (resin sourced from Canada)
Comparison	See how Wide Mouth Ultralite Bottle compares to similar gear

Performance

Weight vs. the competition

At 106g, the Ultralite is a real improvement over a standard Tritan Nalgene — a reviewer on Trailspace measured theirs at 3.75 oz, significantly lighter than a regular Nalgene at 6 oz. That’s a meaningful saving. But let’s be clear about the context: at about 3.5 oz / 100g, it weighs roughly half of a traditional Nalgene, but that still makes it heavier than a narrow-mouth Smartwater bottle at about 1 oz / 28g. If all you’re doing is carrying water on a three-season trip, a recycled Smartwater bottle is objectively the lighter call. The Ultralite earns its weight elsewhere.

Cold-weather hot water bottle

This is where the Ultralite genuinely shines and where no disposable PETE bottle can compete. The Nalgene Wide-Mouth Ultralite earns a place in cold-weather kits, and many hikers use it as a primary bottle on colder trips — fill it with boiling water, toss it in your sleeping bag, and your feet thank you. The plastic is a bit softer than Tritan; it’s fine for dishwashing, but near-boiling water will start to soften the plastic and enough pressure can start to warp the shape slightly. In practice, this is rarely a problem with normal hot-water use; just don’t overfill a scalding bottle and immediately crank the lid down hard.

Filter and purifier compatibility

Water filters fit the wide mouth perfectly, and the big mouth lets you dip it low to gather water from shallow sources — a task that’s sometimes impossible with narrow-mouth bottles.

SteriPen users in particular appreciate the wide opening; the UV wand needs enough space to stir, and it fits without issue here. The one notable asterisk: the Sawyer Squeeze and similar squeeze filters are designed to thread onto standard 28mm narrow-mouth bottles (think Smartwater), not the 63mm Nalgene threads. You’ll need a third-party adapter — several 3D-printed options exist — to gravity-filter into the Ultralite. Nalgene notes it “fits most filtration units,” which is true but worth understanding before committing to a filter setup.

Durability and material feel

HDPE is practically indestructible and has a long, safe track record.

It’s slightly softer and more flexible than Tritan, which actually helps it survive drops that might crack a harder bottle.

The softer plastic is less likely to crack if dropped on a rock.

HDPE does have a slight smell and tends to hold flavored drinks a bit,

though this fades with washing. Stick to water and it’s a non-issue over the long haul.

Visibility and markings

The material is not fully transparent, but it’s easy to see how much water is in the bottle.

The graduation markings only print to 30 oz because the Ultralite is slightly shorter than the Tritan version,

even though it holds the full 32 oz. Mildly annoying if you’re using it as a precise measure for cooking, but not a deal-breaker.

Freeze, leak, and bonus uses

The bottle is firm and holds its shape, but flexible enough to be frozen — the bottom may bulge due to freezing, but it doesn’t crack, and after thawing it returns to the original shape.

The leak-proof threading is rock-solid;

continuous, straight-shouldered semi-buttress threads keep the bottle sealed tight.

One field trick:

wrap a headlamp around it while it’s full of water and it functions as a camp lantern.

Gimmicky, but genuinely useful at 2 a.m.

Pros & Cons

Pros

• About 40% lighter than a standard wide-mouth Nalgene Tritan
• Wide mouth ideal for shallow scooping, SteriPen use, and most filter systems
• Handles hot/boiling water — doubles as a cold-night sleeping bag warmer
• Leak-proof; the Nalgene cap system is battle-tested
• Dishwasher and freezer safe
• HDPE resists cracking on impact better than harder plastics
• Inexpensive (typically under $13) and built to last for years

Cons

• Still ~78g heavier than a Smartwater 1L bottle — not the right call for pure gram-counting
• Sawyer Squeeze doesn’t thread directly onto it; requires an adapter
• HDPE can hold slight odor or taste from flavored drinks or boiling water
• Graduation markings only to 30 oz, despite 32 oz capacity
• Cap loop is not a reliable load-bearing clip — a few users report it can pop free on rough terrain
• Not fully transparent; slightly harder to read exact water level than a clear bottle

Who Should Buy This

The Ultralite earns its spot in the kit for cold-weather backpackers who want a reliable hot water bottle to shove in their sleeping bag on a freezing night. It’s also the right choice for SteriPen users, those who collect water from very shallow sources, and hikers who prefer a reusable hard-sided bottle but don’t want to carry the full 170g weight of a standard Nalgene. If you’re a three-season gram-counter who filters with a Sawyer Squeeze and a stock Smartwater bottle, this probably doesn’t need to be in your bag. But if winter camping is part of your rotation, this Nalgene bottle fills a specific role in the toolbox that a disposable PETE bottle simply can’t.

Verdict

The Nalgene Wide Mouth Ultralite isn’t trying to beat the Smartwater bottle on weight — it’s trying to be a hard-sided, freeze-safe, boiling-water-compatible vessel that still comes in under 4 oz. On those terms, it delivers. The HDPE material is proven, the wide mouth is genuinely useful, and the price is low enough that you won’t agonize over the purchase. Just go in knowing it’s a purpose-specific tool, not a universal water-carry solution. Rating: 7.5 / 10.