Important InformationMaterial: TPUR Packing Size: 2L: 39cm x 18cm x 3cm/15.35" x 7.09" x 1.18" (Approx.) 2.5L: 47cm x 18.8cm x 3cm/18.5" x 7.4" x 1.18" (Approx.) 3L: 52cm x 18.8cm x 3cm/20.47" x 7.4" x 1.18" (Approx.) Overview: The high sealing performance of the hydration system backpack allows it to protect against water leakage. The hydration system backpack is lightweight, which will not make your shoulder and back painful and uncomfortable. Made of TPU material, the hydration system backpack is eco-friendly and durable. The hanging design and foldable design can be conveniently stored. The length of 2L is 39cm, the width is 18cm, and the thickness is 3cm. The length of 2.5l is 47cm, width is 18.8cm, and thickness is 3cm. The length of 3L is 52cm, the width is 18.8cm, and the thickness is 3cm. The backpack with hydration system is suitable for hiking, cycling, camping and so on. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to manual measurement. Specifications:Color: Blue, Army Green Capacity: 2L, 2.5L, 3L (Optional)Features: Large Capacity. Leak-proof, foldablePackage contents:1 x Hydration Pack (others not included)