1. Specifically designed for S1 Pro and for S1 Pro+ , , precise size, fits the speaker like a glove; 2. The design of the sturdy trolley rolling adopts the design of detachable and retractable handles, which is convenient for pushing and pulling the speaker to the stage/party/swimming pool/garden and other locations; 3. The thickened and encrypted nylon cloth is used, which is sturdy and , and the is film-treated, which can play a role in daily waterproofing; 4. The built-in fixed PP backboard has strong three-dimensionality; 5. The rubber stamp zipper head and double zipper closure design are to pulling; The built-in mesh zipper closure storage bag is convenient for storing chargers, charging cables, U disks and other small items; The outer storage bag can store 2 wireless microphones, or umbrellas, water bottles and other items; With adjustable shoulder straps and shoulder pads, it is convenient for users to carry it by hand, on one shoulder, or crossbody. It can be detached and folded, small in size, and can be used with simple installation and fixing. Colour:Black Material:Nylon + Plastic Package Contents: 1 x trolley storage bag 2 x fixed metal rods 1 x adjustable shoulder strap 1 x installation screw accessory bag(The color of the screw accessories is random, no specified color is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.