Applicable models Bicycle Tube Phone Bag for Trek FX Sport Carbon 4 2021. Capacity: 2 liters. Please verify fit with your model before . Key features and benefits sensitivity touchscreen access Transparent TPU touchscreen film allows you to operate your phone inside the bag. The visor keeps the screen clearly visible in bright sunlight. Includes a headphone hole for listening without removing the phone. 2in1 multifunction design Two side pockets plus a removable phone pocket for flexible storage. Phone pocket attaches to the of the bag with Velcro for quick access. The bag sits snugly against the bike frame to avoid interference with pedaling. Generous storage capacity Two side pockets measure 17.5 x 4 x 11.3 cm, providing ample space for bike tools, snacks, or other small items. Use scenarios Daily commuting and city riding Keep essential tools and snacks within reach, while using the touchscreen to operate your phone without removing it. The headphone hole allows listening to music or navigation without opening the bag. Long rides and training sessions Store tools and small items securely in the side pockets; phone pocket remains accessible on . The bag remains flush against the frame to minimize drag and prevent interference with pedaling. Flexible storage when you don't need the phone pocket Remove the phone pocket via Velcro for general storage and use the bag on its own.