1.Fully - Made of waterproof PVC net clamping cloth.High frequency welding technology ensures watertight. This Sahoo bike saddle bag is fully waterproof and super durable , tear and wear resistance, mud and sewage can be cleaned by wiping easily. 2.Ideal Capacity - 2-3L(0.53-0.8Gal), expandable capacity according to your needs . Ideal bicycle saddle bag for holding daily essentials, keys , wallet , small cycling accessories, tire repair kit or multi-tool, etc. 3.Detail is Everything - Super light weight, 180 gram(only 6 oz) .The rear and both sides of this waterproof saddle bag have reflective s to increase your visibility in low light or dark conditions. Taillight hanger allows to attach bike light to the bike rear saddle bag for a ride. 4.Easy to Install - Easy mount and release with 3 points straps and buckles, without involving any tools.The length of straps are adjustable to fit most of saddles.Equipped with double buckles on both sides , no zipper, no leaking . This rear bike pouch can be fixed on saddle without effort.