The ridges are typically formed to attempt to stabilize convenience with air flow and likewise minimize the surface location of your back versus the knapsack. · This is 3 in 1 backpack is very special. · This backpack can be utilized as outdoor camping backpack, travel Backpack, plane knapsack, treking daypack, motorbike backpack, range bag, hunting backpack, survival backpack, Army backpack, laptop knapsack, Trekking Rucksack knapsack or day pack for day-to-day usage.This is a very strong bag. This bag is can be utilized in more than one ways. Following are the key points: · air circulation channels at the back are developed to help aerate your back and delay the start of your sweaty mess. The ridges are normally shaped to attempt to stabilize convenience with air flow and also reduce the area of your back against the knapsack. In hot weather, though, they won't be able to prevent your back from getting sweaty. But at least they'll delay it. · This bag has Molle which implies it is Modular light-weight load-carrying devices and permits users to connected equipment to a range of nylon webbing. · breast bone strap & Hip belt present, they both help in providing a comfortable and tight fit. Apart from provide assistance. Double side compression straps present. · This is 3 in 1 backpack is very special. It can be utilized in 3 methods. It can be used as a shoulder travel Bag. It can also be utilized as a hand held luggage. When required you can roll up the flap, and attach it to the leading creating an amazing looking backpack. · This backpack can be utilized as camping knapsack, travel Knapsack, aircraft knapsack, treking daypack, motorcycle backpack, range bag, hunting knapsack, survival knapsack, Army knapsack, laptop backpack, Travelling Rucksack knapsack or day pack for day-to-day use.