A drink by the campfire after a long day’s hiking is hard to beat. A heavy, clunky flask in your kit is not. That’s the appeal of a titanium flask, and Boundless Voyage makes a 250 ml one aimed at people who pack ultralight.
It’s made to keep the taste of what’s inside and to be light enough that you forget you’re carrying it. We’ve been testing it to see whether such a simple design holds up outdoors.
What’s in the box
A 250 ml hip flask made of 99.8% pure titanium. It weighs 83 g, is leak-proof, has a lid that stays attached and comes with a titanium funnel.
What we like
- Ultralight design, weighs only 83 g
- 99.8% pure titanium, rust-free
- Attached lid guarantees no loss
- 250 ml capacity is pocket size
- Includes a filling funnel
What we don’t
- Narrow opening requires funnel
- High-end titanium price point
- No insulation for temperature
Quick Specs
| Spec | Details |
|---|---|
| Brand | Boundless Voyage |
| Capacity | 250 ml |
| Material | 99.8% Pure Titanium |
| Colour | Titanium |
| Weight | 83 g |
| Size | 14.5 × 2.6 × 14.5 cm |
| Features | Integrated lidTitanium funnelLeak-proof |
First look
The Boundless Voyage Titanium Flask arrives well packed with a storage pouch, which protects the brushed finish. Pick it up and the first thing you notice is how little it weighs. At 83 grams you can slip it into a jacket or back pocket and barely feel it.
The shape is classic: a simple curve that sits comfortably in the palm. The brushed titanium looks and feels like quality. The details are right too. The lid is fixed to the body with a solid titanium connection, so you can’t drop or lose the cap, which matters on the trail. A small funnel with the Boundless Voyage logo is included, and you need it to fill the flask without spilling.
Materials & Build QualityMaterials & Build Quality
The flask is 99.8% pure titanium, which is about the best material for a container like this. It’s strong, it doesn’t corrode or rust and, most importantly, it leaves no aftertaste. Tea, whiskey or whatever you carry tastes the way it should.
It’s solidly made, with clean seams. Titanium is very strong for its weight, which is why it’s used in aerospace and in high-end outdoor gear. The lid screws down to a good seal. The last thing you want is a sticky mess in your backpack, and this flask never leaked on me, even when it was thrown around in a daypack on a rocky trail. The funnel is titanium as well.
Ergonomics & WeightErgonomics & Weight
83 grams for a flask that holds 250 ml is remarkably light. That suits long-distance hiking or cycling, where every gram counts. Even full, it’s comfortable in a back pocket, where it follows the curve of the body.
At 145 x 26 x 145 mm it holds a good amount and is still thin enough to be discreet. It fits the palm well and pours easily. Because the lid is attached, you can use the flask with one hand without juggling a loose cap, which helps on uneven ground or with cold fingers.
If you want something smaller, Boundless Voyage also makes a 200 ml flask. It’s shorter and wider and weighed 75 g on our scale: see our Boundless Voyage titanium hip flask (200 ml) review.
Performance & FeaturesPerformance & Features
The test for any flask is simple: does the drink still taste right? With 99.8% pure titanium, the Boundless Voyage flask passes. There’s no metallic taste at all, which puts it ahead of many stainless steel or plastic flasks.
It doesn’t leak either. The screw-on lid seals tightly, and since it’s attached you never have to go looking for a dropped cap. You do need the funnel: the mouth is narrow, and filling straight from a bottle would spill. It’s a small, well-made flask that should last a lifetime.
250 ml vs 200 ml flask
Boundless Voyage makes two titanium hip flasks we’ve tested. The 250 ml is taller and narrower and holds a bit more; the 200 ml flask is shorter and wider and a little lighter.
This one Boundless 250 ml |  Boundless 200 ml | |
|---|---|---|
| Shape | Tall and narrow | Short and wide |
| Capacity | 250 ml | 200 ml |
| Weight | 83 g | 75 g |
| Price paid | $48 | $45 |
| Our score | 9.1 | 9.2 |
Conclusion: Boundless Voyage Titanium Flask 250 mlConclusion
The Boundless Voyage Titanium Flask is light and well made. It weighs 83 grams, leaves no metallic taste and doesn’t leak, and the attached lid and the funnel make it easy to live with. The opening is narrow, so you need that funnel, it isn’t insulated and titanium costs more than steel. If low weight matters to you, it’s a flask you’ll carry for years.
A light, well-made flask you'll carry for years.
It weighs 83 g, leaves no metallic taste and doesn't leak, and the attached lid and the titanium funnel make it easy to live with. The narrow opening means you need that funnel, it isn't insulated and titanium costs more than steel.
- Backpackers
- Hikers
- Ultralight
Yes, if you want one for life. Titanium costs more than stainless, but it weighs 83 g, won’t rust and adds no taste. The narrow opening needs the included funnel.
