I purchased a newer version of this backpack (the Inateck 42L) last August after looking at the comments of this deal, and it has served me well for the past 6 months. Build quality is extremely solid - been using it to carry loads of up to 15kg on a weekly basis and it has yet to show any signs of wear and tear.
Noticed a double discount on the Inateck 40L (discount + coupon) and thought someone might be interested. Price matches previous ATL per Camelx3.
42L one also has discount. About $83.