This backpack is perfect for running and walking, with a breathable mesh back panel. It will be shipped compactly folded. The following is a product description: This road running pack is designed using the technical expertise of technical packs developed for trail running, and modified for ease of use in city running. It features a lightweight, breathable air mesh back and shoulder harness. The inverted triangle shape allows for storage of items in the upper back, minimizing side-to-side movement and bouncing. It has a 6L capacity and is hydration compatible. It's simple, easy to use, and designed with a focus on lightweight materials and design. ■ Size: 40 x 18 x 5 cm ■ Capacity: 6L ■ Weight: 145g ■ Material: 70D ripstop nylon ■ Features: ・ Lightweight and compact running pack that can be used from commuting runs to races ・ Lightweight air mesh back and shoulder harness for excellent breathability ・ Flap pocket with key clip ・ Slit pocket inside the main body ・ Chest strap ・ Reflector logo on the shoulder