Hey cyclists! This Rookin bike trunk bag is exactly what you need for those longer rides where you need to carry more than just your water bottle. With 7 liters of storage space, it's perfect for packing your tools, snacks, extra layers, or even some small groceries. The water-resistant PU material and zippers mean your stuff stays dry in light rain, and when the weather really turns nasty, just pull out the included waterproof rain cover for full protection. What's really handy are the adjustable elastic cords on top - perfect for securing a jacket or helmet when you're not wearing them. The reflective straps around the bag are a nice safety touch for those evening rides when visibility matters. Installation is super simple with the durable fastener straps that attach securely to your bike rack, and the thin protective PE foam interior adds some cushioning for your gear. The main compartment gives you plenty of space, plus there's a separate zipper pocket for organizing smaller items like keys, phone, or wallet. Measuring 29.5x16.5x12cm (about 11.6x6.5x4.7 inches), it's spacious without being bulky, and at only 300g it won't weigh you down. Whether you're commuting to work, going on a weekend adventure, or just need reliable storage for your daily rides, this trunk bag delivers practical functionality that makes cycling more convenient. The quality construction feels durable enough to handle regular use, and the thoughtful design features show this was made by people who actually ride bikes. No more struggling with overloaded backpacks or worrying about your gear getting wet - this bag has you covered for all kinds of riding conditions.