The telescopic handle of a wheeled duffle bags is designed for ease of use and convenience while transporting the bag. Here's how it typically works:

Telescoping Mechanism: The telescopic handle is usually housed inside a sleeve or channel on the back or top of the duffle bag. It consists of several tubular sections that can slide in and out of each other.

Release Button or Lever: To extend or retract the telescopic handle, there is usually a release button, lever, or similar mechanism located near the top of the handle or on the handle grip itself. This button or lever is used to engage or disengage the locking mechanism that holds the handle in place.

Extension: To extend the handle, press and hold the release button or lever while gently pulling the handle upward. As you pull, the sections of the handle will slide out and lock into place at the desired height. The handle typically clicks or locks securely at different height settings to accommodate users of varying heights.

Retraction: To retract the handle for storage or when not in use, press and hold the release button or lever again and push the handle downward. The sections of the handle will collapse and slide into one another, returning to their compact position within the sleeve or channel.

Locking in Place: The telescopic handle is designed to lock securely when fully extended or fully retracted, ensuring that it remains stable during use and doesn't accidentally collapse or extend while you're moving the bag.

Durability: Telescopic handles are typically made from sturdy materials like aluminum or plastic, ensuring that they can withstand the rigors of travel.