The Terra Incognita Duett is a double-wall vacuum-insulated stainless steel thermos that holds 1000 ml (34 fl oz) and ships with two nesting cups, built for pairs and small groups who want to share a hot drink in the field. The two included cups, at roughly 200 ml and 190 ml, twist onto the top for transport and let two people drink at once without extra gear, while a hammer-coated exterior shields the flask against the dents and scrapes of expedition travel. It is a rugged communal thermos that keeps liquids hot or cold across long days outdoors.
Terra Incognita is a European outdoor brand with over 18 years of expedition experience and its own gear manufacturing, and the Duett reflects that with premium 18/8 food-grade steel, a leak-proof pour-through stopper, and finish details tuned for hard use. At 620 g it is a substantial flask, chosen for capacity and durability rather than minimalist weight, and it pays that back with heat retention and shared-drink convenience.
Who is the Duett thermos designed for?
The Duett is made for couples, hiking partners, and small groups who share hot drinks on the trail, at a viewpoint, or in a hunting blind. Its 1000 ml capacity and two-cup system suit day hikes, ski tours, and roadside stops where one bottle needs to serve two. At 620 g it is best carried in a pack with shared load or in a vehicle, rather than as a solo ultralight item.
What is the Duett thermos made of?
The flask body is premium 18/8 food-grade stainless steel, vacuum-insulated between two walls to trap temperature and prevent condensation on the outside. The distinctive hammer-coating finish adds a textured, damage-resistant layer that helps the Duett survive the drops and scrapes of real expeditions. The pour-through stopper seals tightly for leak-proof transport, yet dispenses without full removal.
How do you pour from the Duett's two cups?
In use, you unscrew the two stacked cups, open the pour-through stopper, and serve two drinks without ever fully exposing the contents to cold air, which preserves heat. The vacuum wall keeps the last pour nearly as hot as the first across a long day. When empty, the cups nest back over the top and the stopper locks down for a clean, leak-free carry.
Specifications
| Characteristic | Duett 1000 | Duett 1200 |
|---|---|---|
| Weight (US) | 21.9 oz | 24.3 oz |
| Weight (EU) | 620 g | 690 g |
| Packed Size (US) | ∅3.7 × 11.3 in | ∅3.7 × 12.6 in |
| Packed Size (EU) | ∅95 × 286 mm | ∅95 × 320 mm |
| Volume (US) | 34 fl oz | 40 fl oz |
| Volume (EU) | 1000 ml | 1200 ml |
| Cup Volumes (US) | 6.8 fl oz & 6.4 fl oz (Included) | |
| Cup Volumes (EU) | 200 ml & 190 ml (Included) | |
| Material | Premium 18/8 Food-Grade Stainless Steel | |
| Finish | Anti-Scratch Hammer Powder Coating | |
| Insulation | Double-Wall Vacuum Insulated | |
| Stopper Type | Precision Pour-Through Threaded Stopper | |
| Best Use | Hiking, Camping, Overlanding, Tactical Use | |
| Product Type | Heavy-Duty Vacuum Flask | |
Key features
- Generous 1000 ml (34 fl oz) capacity serves two people multiple rounds of hot or cold drinks from a single fill
- Two included insulated cups (about 200 ml and 190 ml) let a pair share drinks in the field with no extra cups to pack
- Double-wall vacuum insulation holds liquids hot or cold for extended periods, keeping coffee warm from trailhead to summit
- Premium 18/8 food-grade stainless steel construction stays odor-free and taste-neutral, fill after fill
- Hammer-coating exterior finish resists mechanical damage and wear from rough handling and pack abrasion
- Leak-proof pour-through stopper lets you serve without fully removing the plug, so less heat escapes with each pour
- Practical for two-person trips at 620 g (21.9 oz), balancing capacity and durability over ultralight minimalism
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. Every item carries a 12-month manufacturer warranty, and the design is tested in the field by the people who guide the trips.
Duett FAQ
How much does the Duett thermos hold?
The Duett holds 1000 ml (34 fl oz) of liquid and includes two cups of roughly 200 ml and 190 ml. That capacity is enough to serve two people several rounds of coffee, tea, or soup from a single fill, making it well suited to shared use on the trail.
Does the thermos come with cups?
Yes, two insulated drinking cups are included and nest over the top of the flask for transport. Together they let two people drink at the same time without packing separate mugs, which is why the Duett is designed for pairs and small groups.
How long does the Duett keep drinks hot?
Its double-wall vacuum insulation keeps liquids hot or cold for extended periods, easily covering a full day outdoors. The leak-proof pour-through stopper adds to this by letting you serve without removing the plug, so less heat escapes each time you pour.
How much does the Duett weigh?
The Duett weighs 620 g (21.9 oz) empty. That reflects its 1000 ml capacity, two included cups, and rugged hammer-coated steel build, making it a durable choice for two-person trips and vehicle-based camping rather than a solo ultralight flask.
Related gear
See more in Kitchen & Utensils, Thermoses & Mugs, Base Camp Status chair, Steel Bol 500.
The Terra Incognita Duett is a double-wall vacuum-insulated stainless steel thermos that holds 1000 ml (34 fl oz) and ships with two nesting cups, built for pairs and small groups who want to share a hot drink in the field. The two included cups, at roughly 200 ml and 190 ml, twist onto the top for transport and let two people drink at once without extra gear, while a hammer-coated exterior shields the flask against the dents and scrapes of expedition travel. It is a rugged communal thermos that keeps liquids hot or cold across long days outdoors.
Terra Incognita is a European outdoor brand with over 18 years of expedition experience and its own gear manufacturing, and the Duett reflects that with premium 18/8 food-grade steel, a leak-proof pour-through stopper, and finish details tuned for hard use. At 620 g it is a substantial flask, chosen for capacity and durability rather than minimalist weight, and it pays that back with heat retention and shared-drink convenience.
Who is the Duett thermos designed for?
The Duett is made for couples, hiking partners, and small groups who share hot drinks on the trail, at a viewpoint, or in a hunting blind. Its 1000 ml capacity and two-cup system suit day hikes, ski tours, and roadside stops where one bottle needs to serve two. At 620 g it is best carried in a pack with shared load or in a vehicle, rather than as a solo ultralight item.
What is the Duett thermos made of?
The flask body is premium 18/8 food-grade stainless steel, vacuum-insulated between two walls to trap temperature and prevent condensation on the outside. The distinctive hammer-coating finish adds a textured, damage-resistant layer that helps the Duett survive the drops and scrapes of real expeditions. The pour-through stopper seals tightly for leak-proof transport, yet dispenses without full removal.
How do you pour from the Duett's two cups?
In use, you unscrew the two stacked cups, open the pour-through stopper, and serve two drinks without ever fully exposing the contents to cold air, which preserves heat. The vacuum wall keeps the last pour nearly as hot as the first across a long day. When empty, the cups nest back over the top and the stopper locks down for a clean, leak-free carry.
Specifications
| Characteristic | Duett 1000 | Duett 1200 |
|---|---|---|
| Weight (US) | 21.9 oz | 24.3 oz |
| Weight (EU) | 620 g | 690 g |
| Packed Size (US) | ∅3.7 × 11.3 in | ∅3.7 × 12.6 in |
| Packed Size (EU) | ∅95 × 286 mm | ∅95 × 320 mm |
| Volume (US) | 34 fl oz | 40 fl oz |
| Volume (EU) | 1000 ml | 1200 ml |
| Cup Volumes (US) | 6.8 fl oz & 6.4 fl oz (Included) | |
| Cup Volumes (EU) | 200 ml & 190 ml (Included) | |
| Material | Premium 18/8 Food-Grade Stainless Steel | |
| Finish | Anti-Scratch Hammer Powder Coating | |
| Insulation | Double-Wall Vacuum Insulated | |
| Stopper Type | Precision Pour-Through Threaded Stopper | |
| Best Use | Hiking, Camping, Overlanding, Tactical Use | |
| Product Type | Heavy-Duty Vacuum Flask | |
Key features
- Generous 1000 ml (34 fl oz) capacity serves two people multiple rounds of hot or cold drinks from a single fill
- Two included insulated cups (about 200 ml and 190 ml) let a pair share drinks in the field with no extra cups to pack
- Double-wall vacuum insulation holds liquids hot or cold for extended periods, keeping coffee warm from trailhead to summit
- Premium 18/8 food-grade stainless steel construction stays odor-free and taste-neutral, fill after fill
- Hammer-coating exterior finish resists mechanical damage and wear from rough handling and pack abrasion
- Leak-proof pour-through stopper lets you serve without fully removing the plug, so less heat escapes with each pour
- Practical for two-person trips at 620 g (21.9 oz), balancing capacity and durability over ultralight minimalism
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. Every item carries a 12-month manufacturer warranty, and the design is tested in the field by the people who guide the trips.
Duett FAQ
How much does the Duett thermos hold?
The Duett holds 1000 ml (34 fl oz) of liquid and includes two cups of roughly 200 ml and 190 ml. That capacity is enough to serve two people several rounds of coffee, tea, or soup from a single fill, making it well suited to shared use on the trail.
Does the thermos come with cups?
Yes, two insulated drinking cups are included and nest over the top of the flask for transport. Together they let two people drink at the same time without packing separate mugs, which is why the Duett is designed for pairs and small groups.
How long does the Duett keep drinks hot?
Its double-wall vacuum insulation keeps liquids hot or cold for extended periods, easily covering a full day outdoors. The leak-proof pour-through stopper adds to this by letting you serve without removing the plug, so less heat escapes each time you pour.
How much does the Duett weigh?
The Duett weighs 620 g (21.9 oz) empty. That reflects its 1000 ml capacity, two included cups, and rugged hammer-coated steel build, making it a durable choice for two-person trips and vehicle-based camping rather than a solo ultralight flask.
Related gear
See more in Kitchen & Utensils, Thermoses & Mugs, Base Camp Status chair, Steel Bol 500.
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