✔ Size S, fit for chest circumference 80 to 88cm (31.5 to 34.5 inch), Capacity 8L
✔ Size M, fit for chest circumference 88 to 98cm (34.5 to 38.5 inch), Capacity 8L
✔ Size L: For Chest chest circumference 99 to 108cm (38.5 to 42.5 inch), Capacity 8.5L
✔ Size XL: For Chest chest circumference 108 to 118cm (42.5 to 46.5 inch), Capacity 9L

Backpack Features
✔ Designed exactly for trail running and road run. Works also good for cycling, hiking, outdoor adventures.
✔ The construction is based on the concept of comfortably wrapping your body without hindrance or chafing.
✔ Fabric dries fast and keeps your body breathing. All potential chafing zones have been revisited and made smooth.
✔ Trekking pole hanging systems.
✔ Compatible with 2 soft flasks (500ml/16oz) and 1L bladder.
✔ Weights only about 200g, super light for race or training.
✔ Adjustable chest and waist belts to properly wrap your body, prevent it from shaking when you are running.

Package included:
✔ 1 x backpack