Best Buy offers the HP Outdoor Sport 16" Laptop Backpack in Gray/Yellow/Turquoise, model no. f4f29aa#abl, for $24.99. Opt for in-store pickup to dodge the $3.99 shipping fee. That's the lowest price we could find by $10, outside of the mention below It features an internal pocket organizer, water bottle pockets, and storage for laptops up to 15.6".
A close price: HP Home & Home Office Store offers it for $25.99 with free shipping.