ebags.com is selling this very highly rated travel backpack for $110 after code 'SAVE48HRS' ($160 - $50).
Red or light blue colors only ones in stock, the nicer dark gray is sold out until June. This 40L bag (or 38L for s/m size) is the maximum size for carry-on on MOST airlines so very convenient. Also, Osprey has a legit lifetime warranty.
There is currently a SD on the slightly larger Osprey Porter 46 backpack for $95 at REI which is also a good price but this pack is more sturdy & comfortable so better option if you will be carrying it longer. There was also a Frontpage deal for this S/M size pack for $95 last month but this one has both sizes (S/M and M/L) and slightly cheaper if you don' t mind the cashback inconvenience.