One of the most durability and rough and tough bag is Comfy bags you will get through online as well as In Bangalore also as per my experience till now.
I have used only comfy bags not only me my whole families including cousines as well they use comfy bags only for school, travel, laptop bag also you will get and price also very reasonable.
I have purchased one lap top bag since 3 years ago till now its durability is very good and its price was only 500/- rupeesin this you will get rainy cover bag also.
My suggestion is if anybody wants to purchase comfy bags they can directly goto comfy industries whoever staying in bangalore why i am sharing this because its durability is very good as compare to other branded bags as well.