While trolley backpack offer great versatility, they do have some terrain limitations due to their wheeled design. Here are some terrain types where trolley backpacks may not perform as well:

Rough and uneven surfaces: Trolley backpacks are best suited for smooth and flat surfaces, such as airport terminals, train stations, or paved sidewalks. On rough or uneven terrain like gravel paths, rocky trails, or unpaved roads, the wheels may not provide adequate stability or smooth rolling. In such cases, it's better to use the backpack in the traditional mode by wearing it on your back to maintain balance and control.

Stairs: While trolley backpacks can be converted into backpacks for climbing stairs, they are not as convenient as regular backpacks designed for this purpose. Negotiating stairs with a trolley backpack can be awkward, and carrying it on your back for extended stair climbs might not be as comfortable as a backpack with specialized shoulder straps and back support.

Soft surfaces: Trolley backpacks may struggle on soft surfaces like sand, mud, or thick grass, as the wheels can sink and become difficult to pull. In such situations, carrying the backpack on your back is more practical.

Crowded or narrow spaces: In crowded areas or tight spaces, maneuvering a trolley backpack with wheels can be challenging. It might be more efficient to switch to the backpack mode, so you have better control and don't accidentally bump into people or objects.

Overhead compartments: Trolley backpacks may not fit well in small overhead compartments on planes or buses, especially when fully extended with the handle. It's essential to check the bag's dimensions and consider the specific requirements of the mode of transportation you'll be using.

Hiking trails: For serious hiking or trekking on challenging trails, a dedicated hiking backpack with specialized features like waist belts, load-bearing systems, and rugged construction is more suitable. Trolley backpacks lack these features, making them less comfortable and practical for extended outdoor adventures.