A duffel bag should be:

A duffel bag should be lightweight and easily carried because the essential purpose of a duffel bag in search and rescue scenarios is to transport necessary equipment and personal items conveniently and efficiently. Search and rescue operations often involve quick mobilization and navigating various terrains, so having a bag that is easy to carry minimizes fatigue and allows for better focus on the tasks at hand.

While other options such as being waterproof or made from durable materials are certainly beneficial features for a duffel bag, the primary aspect that ensures ease of use and portability in high-stress environments is its lightweight design. This allows individuals to adapt quickly and move seamlessly during operations, reflecting the importance of efficiency and practicality in emergency situations.