Smooth Swivel Wheels: High-quality wheel design for smooth maneuverability, allowing easy direction changes anytime, anywhere. The track-style swivel wheels can bear heavy loads, making it effortless to carry a large number of tools. Hidden Wheel Cover: When switching to backpack mode, the wheel cover prevents the wheels from dirtying your clothes, keeping everything clean. Hidden Shoulder Straps: In trolley mode, the hidden shoulder straps protect them from getting dirty, ensuring they stay clean and in good condition. Adjustable Luggage Handle: The handle can be adjusted to match your height, providing a more comfortable user experience. Large Capacity: With 55 pockets and loops, the large main compartment can hold a variety of tools, including large-sized ones, meeting all your storage needs. Detachable Inner Pocket Panel: The main compartment features a detachable pocket panel, allowing for easy removal when you don't need to carry many tools, making it lightweight and portable. Password Lock Protection: Equipped with a default code of 0-0-0, the password lock offers extra security, ensuring your tools are safe during transport or storage. Backpack Tool Bag with Wheel, Rolling Tool Backpack for Electrician Heavy Duty Roller Tool Bag on Wheel for Construction Work, 75 Pockets & Loops Tool Backpack with Molded Base and Combination Lock