- Expandable Storage: The 13.5L rear bike bag expands from 8L to 13.5L, measuring 14 x 6 x 9.8 inches (L x W x H). It provides ample space for your essentials such as wallets, phones, towels, clothes, bike tools, water bottles, maps, and snacks. The bag features a main compartment, two side pockets, a top mesh pouch, and an inner mesh pocket, ensuring your items stay organized. - Water Resistant: Constructed from durable PU leather polyester, this bike rack bag is water-repellent and easy to clean. It safeguards your belongings from dust, sand, rain, and snow, and its solid structure ensures it maintains its shape while looking stylish. - Versatile Design: This rear bike bag doubles as a fashionable commuter chest bag. Simply extract the hidden shoulder strap from the bottom pocket and attach it to the loop. It also includes a comfortable handle for easy carrying when not in use. - Convenient Carry Options: Equipped with a top hand strap and adjustable shoulder straps, this multifunctional bicycle bag is designed for comfort and ease of transport when off the bike. - Practical Applications: Ideal for daily commutes, weekend rides, or outdoor adventures, this bag allows you to carry everything from work essentials to picnic supplies. Whether you're navigating city streets or exploring scenic trails, this bag meets your storage needs effectively. This rear bike bag combines functionality, style, and convenience, making it an essential accessory for any cyclist.