This simple, waterproof, and compact cycling backpack boasts a surprisingly large capacity. * Lightweight design reduces strain on the body even during extended use. * Provides a secure fit during sports activities. * Features a helmet fixation cover for convenient helmet storage. * Equipped with reflective tape for safe use at night. * Mesh back panel promotes breathability and reduces fatigue during prolonged use. * Compatible with hydration systems (hydration pack not included). ◇ Versatile for Various Scenes ◇ Ideal for cycling, as well as marathon running, jogging, walking, mountain climbing, training, trekking, hiking, camping, fishing, strolling, outdoor activities, and various other sports. Its lightweight design also makes it suitable for seniors' walks! 【Capacity】 Approximately 5 liters 【Weight】 Approximately 330g 【Material】 Polyester 【Size】 Approximately 41cm (height) x 29cm (width) x 10cm (depth) 【Color】 Black 【Notes】 There may be some loose threads. 【Shipping Method】 Will be folded and shipped via simple packaging Mercari delivery. Please report any initial defects before leaving a rating.