SMART STORAGE - Internal and external pockets including a laptop-friendly sleeve keep all your gear in order , BREATHE EASY - Vented-foam Flow back system lets your skin breathe , Rucksack (20 Litre/Blue) , Twenty Four Seven Plus 20 , HYDRATION COMPATIBLE - Hydration system compatible, so you can keep refreshed wherever your day takes you , Durable polyester fabric stays smart and scuff-free , Attachment points for walking poles