Bicycle Tube Phone Bag for Trek Procaliber SL 2019 Capacity 2 liters. Please check if the product fits your model before . sensitivity touchscreen and visor: The transparent TPU touchscreen film allows you to operate your phone while it is inside the bag. The visor keeps the screen readable in strong sunlight. Headphone access: Includes a headphone hole for listening while riding. Multifunctional design: Two side pockets and a removable phone pocket. The phone pocket is securely attached to the of the bag with Velcro. The bag sits flush against the bike frame to avoid interfering with pedaling. Large capacity: Two side pockets measure 17.5 x 4 x 11.3 cm, providing ample storage for bike tools, snacks, or other small items. Use scenarios: On long rides or gravel trips to carry tools and snacks within easy reach; for daily commutes when you need quick access to your phone and music; on rides in bright sun where the visor helps keep the screen visible.