An ultralight backpack tent is defined by its extremely low weight, making it ideal for backpackers, hikers, and other outdoor enthusiasts who prioritize minimizing the weight of their gear. These tents are typically designed to weigh under 3 pounds (1.36 kg) for a one-person tent and around 4-5 pounds (1.8-2.3 kg) for a two-person tent, although some ultralight models can weigh even less.

The design of an ultralight tent focuses on reducing weight without sacrificing essential functions like shelter, weather protection, and ease of setup. To achieve this, manufacturers use lightweight, durable materials (such as silnylon, Dyneema, or lightweight polyester fabrics) and streamlined designs that often sacrifice certain features (like extra vestibules or thicker poles) to cut down on weight.

Ultralight tents also tend to have minimalist structures—sometimes relying on a single pole, trekking poles, or no poles at all (using the ground or trees for support). They are most suitable for experienced campers who are comfortable with less space, fewer luxuries, and potentially more challenging setups compared to heavier, more feature-rich tents.

In summary, an ultralight tent is characterized by its minimal weight, compact design, and focus on efficiency, making it a perfect choice for those who need to keep their pack weight as low as possible during long-distance treks or fastpacking adventures.