The Nomatic bag is made from nylon and polyester, which are both fine for travel (and probably better, even, in inclement weather than material more suited for clothing storage)
Know how to protect backpack when checked as luggage This is a must not only because the airport & airline staff aren't gentle to luggages and packs at all, but also conveyor belts can do a lot of damage to your pack (especially to straps, belts, zippers and buckles)
The backpacks I consistently trust for everyday use are from The North Face, mainly because theyre built for real wear: long walks across campus, commuting days where Im carrying my whole life, and random weather that changes mid-day
Go for one with padded shoulder straps, a ventilated back panel to keep you cool, and many compartments to keep your gear organized