Amazon offers the Ranipak Luggage Durable Utility Laptop Backpack in Green, model no. B0158GN, for $10.85. Coupon code "FUN20SUN" cuts it to $8.68. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.48.) That's $6 under last month's mention and the lowest total price we've seen. (It's a current low by $22.) It accommodates a 15.6" notebook and features an iPad/Tablet compartment, smartphone organizer, and water bottle pocket.
It's available in Black for about a buck more.