eBags has the High Sierra Loop Daypack Backpack (several colors) for $35 - $15 off with coupon IMRLOOP = $20 with free shipping. Features a tablet sleeve, beverage holder, and padded airmesh shoulder straps.
Amazon has the Timbuk2 Wingman Large Travel Duffel Bag (Black; 528-4-2000) for $59 with free shipping. Retail price: $150. Converts from a duffel to a backpack with removable backpack straps, size for international carry-on- no need to check it, side expandable pockets for shoes/organization, secure padded pockets carry up to a 17" MacBook Pro & an iPad.
Has excellent Amazon Reviews.
Amazon has the Modoker 15" Laptop Backpack w/ Charging Port (Grey, 2018) for $25.99 - $6.50 off with coupon AY22MI2H (Ends 11/10) = $19.49 with free shipping. Made of High quality 600D Nylon Fabric. It features padded straps and multiple compartments,w ith external USB charging port & set-in charging cable.
Has good Amazon Reviews.