The Waterflow Izotube is a 2 L hydration reservoir made from premium food-grade TPU with a low-profile internal baffle that stops water from sloshing or bulging your pack. Built for hikers, cyclists, and runners who drink on the move, it combines a BPA-free, odorless bladder with a neoprene-insulated tube that resists both freezing and heat from -20 C to +50 C (-4 F to 122 F). If you want steady, hands-free hydration that keeps its shape and its taste-neutral flow, this is the reservoir to reach for.
Terra Incognita is a European outdoor brand with over 18 years of expedition experience and its own gear production, and the Izotube reflects that attention to real-use detail. From the wide slider closure that makes refilling and cleaning fast, to the 45-degree bite valve with a dust cover, every part is tuned for people who actually rely on their reservoir through long, hard days.
Who is the Waterflow Izotube made for?
This reservoir suits hikers, trail runners, mountain bikers, and backcountry travelers who want to sip continuously rather than stop and unpack a bottle. The 2 L capacity covers most full days, and the anti-slosh baffle makes it a strong pick for anyone doing dynamic movement, from technical descents to fast running, where a sloshing, bulging bladder throws off balance and comfort.
What is the Waterflow Izotube made of?
The bladder is molded from premium food-grade TPU chosen for its strength and odor-free performance, so it holds up to repeated compression without cracking or tainting the water. The tube is wrapped in a waterproof neoprene thermal sleeve rated from -20 C to +50 C, which slows freezing in winter and heat soak in summer. The internal baffle is what keeps the whole thing flat and stable against your spine.
How do you clean the Waterflow Izotube?
The wide slider closure is the key to easy upkeep: pop it open and the bladder lays flat for scrubbing, rinsing, and full air-drying, which prevents mildew and off-tastes. Between outings, store it open and dry. The 45-degree bite valve twists to lock and carries a dust cover, so you can keep the mouthpiece clean between sips on dusty trails.
Specifications
| Characteristic | Izotube 2.0 | Izotube 3.0 |
|---|---|---|
| Capacity (EU) | 2.0 L | 3.0 L |
| Capacity (US) | 67.6 fl oz | 101.4 fl oz |
| Weight (EU) | 166 g | 184 g |
| Weight (US) | 5.85 oz | 6.49 oz |
| Dimensions (EU) | 37 × 17 cm | 47 × 17 cm |
| Dimensions (US) | 14.6 × 6.7 in | 18.5 × 6.7 in |
| Tube Dimensions (EU) | ∅1 × 100 cm | |
| Tube Dimensions (US) | ∅0.4 × 39.4 in | |
| Material | Premium Food-Grade TPU (BPA-Free / Odorless) | |
| Interior Surface | Smooth Anti-Bacterial Biofilm Resistance | |
| Tube Insulation | Waterproof Neoprene Thermal Sleeve | |
| Seam Technology | RF-Welded High-Elasticity Double Seams | |
| Valve Type | 45° Ergonomic Bite Valve with On/Off Lock | |
| Valve Protection | Tethered Protective Dust Cap | |
| Connection System | Quick-Release Auto-Lock Connector (Leak-Proof) | |
| Closure System | Wide-Mouth Dual-Direction Slider Lock | |
| Pack Integration | Integrated Hanger Hole in Slider Lock | |
| Liquid Tracking | Graduated Measurement Markings | |
| Internal Structure | Vertical Low-Profile Stability Baffle | |
| Temperature (EU) | -20°C to +50°C | |
| Temperature (US) | -4°F to 122°F | |
| Best Use | Hiking, Cycling, Adventure Racing, Overlanding | |
| Product Type | Insulated High-Performance Hydration Reservoir | |
Key features
- Medical-grade, food-safe TPU is strong, BPA-free, and completely odorless, so your water tastes like water and never like plastic.
- A neoprene thermal sleeve shields the tube across a wide -20 C to +50 C (-4 F to 122 F) range, helping resist freeze-up in cold and heat gain in sun.
- A low-profile internal baffle eliminates sloshing and stops the 2 L bladder from bulging against your back inside the pack.
- The ergonomic 45-degree bite valve delivers high flow and includes a dust cover to keep grit out of the mouthpiece on the trail.
- A wide-mouth slider closure opens fully for lightning-fast refills and lets you reach inside for thorough cleaning and drying.
- Holds 2.0 L (67.6 fl oz) at just 166 g (5.85 oz), giving a full day of water without adding meaningful weight to your load.
Who makes it
Terra Incognita has spent more than 18 years running trips and expeditions and manufacturing its own outdoor gear, so this model comes off the brand's own production line rather than a rebadged catalog. The design is tested in the field by the people who guide the trips.
The Waterflow Izotube is a 2 L hydration reservoir made from premium food-grade TPU with a low-profile internal baffle that stops water from sloshing or bulging your pack. Built for hikers, cyclists, and runners who drink on the move, it combines a BPA-free, odorless bladder with a neoprene-insulated tube that resists both freezing and heat from -20 C to +50 C (-4 F to 122 F). If you want steady, hands-free hydration that keeps its shape and its taste-neutral flow, this is the reservoir to reach for.
Terra Incognita is a European outdoor brand with over 18 years of expedition experience and its own gear production, and the Izotube reflects that attention to real-use detail. From the wide slider closure that makes refilling and cleaning fast, to the 45-degree bite valve with a dust cover, every part is tuned for people who actually rely on their reservoir through long, hard days.
Who is the Waterflow Izotube made for?
This reservoir suits hikers, trail runners, mountain bikers, and backcountry travelers who want to sip continuously rather than stop and unpack a bottle. The 2 L capacity covers most full days, and the anti-slosh baffle makes it a strong pick for anyone doing dynamic movement, from technical descents to fast running, where a sloshing, bulging bladder throws off balance and comfort.
What is the Waterflow Izotube made of?
The bladder is molded from premium food-grade TPU chosen for its strength and odor-free performance, so it holds up to repeated compression without cracking or tainting the water. The tube is wrapped in a waterproof neoprene thermal sleeve rated from -20 C to +50 C, which slows freezing in winter and heat soak in summer. The internal baffle is what keeps the whole thing flat and stable against your spine.
How do you clean the Waterflow Izotube?
The wide slider closure is the key to easy upkeep: pop it open and the bladder lays flat for scrubbing, rinsing, and full air-drying, which prevents mildew and off-tastes. Between outings, store it open and dry. The 45-degree bite valve twists to lock and carries a dust cover, so you can keep the mouthpiece clean between sips on dusty trails.
Specifications
| Characteristic | Izotube 2.0 | Izotube 3.0 |
|---|---|---|
| Capacity (EU) | 2.0 L | 3.0 L |
| Capacity (US) | 67.6 fl oz | 101.4 fl oz |
| Weight (EU) | 166 g | 184 g |
| Weight (US) | 5.85 oz | 6.49 oz |
| Dimensions (EU) | 37 × 17 cm | 47 × 17 cm |
| Dimensions (US) | 14.6 × 6.7 in | 18.5 × 6.7 in |
| Tube Dimensions (EU) | ∅1 × 100 cm | |
| Tube Dimensions (US) | ∅0.4 × 39.4 in | |
| Material | Premium Food-Grade TPU (BPA-Free / Odorless) | |
| Interior Surface | Smooth Anti-Bacterial Biofilm Resistance | |
| Tube Insulation | Waterproof Neoprene Thermal Sleeve | |
| Seam Technology | RF-Welded High-Elasticity Double Seams | |
| Valve Type | 45° Ergonomic Bite Valve with On/Off Lock | |
| Valve Protection | Tethered Protective Dust Cap | |
| Connection System | Quick-Release Auto-Lock Connector (Leak-Proof) | |
| Closure System | Wide-Mouth Dual-Direction Slider Lock | |
| Pack Integration | Integrated Hanger Hole in Slider Lock | |
| Liquid Tracking | Graduated Measurement Markings | |
| Internal Structure | Vertical Low-Profile Stability Baffle | |
| Temperature (EU) | -20°C to +50°C | |
| Temperature (US) | -4°F to 122°F | |
| Best Use | Hiking, Cycling, Adventure Racing, Overlanding | |
| Product Type | Insulated High-Performance Hydration Reservoir | |
Key features
- Medical-grade, food-safe TPU is strong, BPA-free, and completely odorless, so your water tastes like water and never like plastic.
- A neoprene thermal sleeve shields the tube across a wide -20 C to +50 C (-4 F to 122 F) range, helping resist freeze-up in cold and heat gain in sun.
- A low-profile internal baffle eliminates sloshing and stops the 2 L bladder from bulging against your back inside the pack.
- The ergonomic 45-degree bite valve delivers high flow and includes a dust cover to keep grit out of the mouthpiece on the trail.
- A wide-mouth slider closure opens fully for lightning-fast refills and lets you reach inside for thorough cleaning and drying.
- Holds 2.0 L (67.6 fl oz) at just 166 g (5.85 oz), giving a full day of water without adding meaningful weight to your load.
Who makes it
Terra Incognita has spent more than 18 years running trips and expeditions and manufacturing its own outdoor gear, so this model comes off the brand's own production line rather than a rebadged catalog. The design is tested in the field by the people who guide the trips.
Questions & answers
Waterflow Izotube FAQ
Is the Izotube bladder BPA-free?
Yes, it is made from premium food-grade TPU that is BPA-free and completely odorless. The material is chosen so your water tastes clean rather than plasticky, even after repeated use and compression inside a pack.
How much water does it hold?
This reservoir holds 2.0 L (67.6 fl oz), enough for most full-day outings. Despite that capacity it weighs only 166 g (5.85 oz), so it adds hydration without weighing down your pack.
Will the tube freeze in cold weather?
The tube is wrapped in a waterproof neoprene thermal sleeve rated from -20 C to +50 C (-4 F to 122 F), which helps resist freezing in cold conditions and heat gain in the sun. In hard freezes, blowing water back into the bladder after each sip further reduces the chance of a frozen line.
Does it stop water from sloshing around?
Yes, a low-profile internal baffle runs through the bladder to eliminate sloshing and keep it from bulging. That keeps the load stable and quiet against your back during running, cycling, and technical descents.
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