The category refers to sleeping bags designed to minimize their volume and dimensions when compressed for storage or transport. An example would be a down-filled sleeping bag specifically engineered with lightweight fabrics and a tight compression sack, resulting in a significantly reduced packed size compared to traditional models.
The desirability of achieving minimal packed size stems from the need for portability in backpacking, hiking, and other activities where space and weight are critical factors. A more compact sleeping bag allows for efficient packing of gear, reducing overall load and improving maneuverability. Historically, advancements in materials and construction techniques have progressively reduced the packed size of these essential outdoor items.