I bought a Columbia book bag with an laptop pocket that fits a 15' but only because i have a Sumo Case for my MB, which is very well padded, so when i put it in my book bag it sits nice and tight. But if you want something small for your MB, why buy a 15' and cary the extra size around?! Besides, you would want your laptop to be secured in the bag, so it doesn't flop around.

Bestbuy just had on sale an Incase carrying case like what you're looking for, but I don't know if they still do. You might be able to find one at your local store, they were like $19.99.

100% VanGoddy Brand New and high quality Personalized VanGoddy polished chrome hardware and PU leather accents Perfect compatible with 15.6 inch Laptop Made with high quality new Water resistant material and heavy duty stitching Large Main compartment and removable divider for your devices Large zipper and padded compartment with security straps Luggage strap provides secure and easy of carrying for the active traveler External strap allow you put the bag on the luggage Adjustable and Padded Straps for comfortable wear Be fashionable, comfortable, Dustproof,protect from collision. Features accessory pockets for cables, chargers, external keyboard, mouse,etc Take your device anywhere. Internal Dimensions: 15.5 X 11.5 X 2 inches External Dimensions: 16.25 X 12 X 3 inches Color: Black. Noteburner m4v converter plus for mac. Description: -High quality handle bag with shoulder strap -Multiple pen/pencil pocket,Dual straps will securely hold your devic.Removable shoulder strap, Very Convenient!!!

-Compatible with: most popular 13'-14' laptops,such as 13.3' MacBook Pro/Samsung Galaxy Note 9/Dell XPS 13 -Internal Dimensions 14.5 x 3 x 10.75” -External Dimensions 15.5 x 3 x 12” -Brand:SumacLife -Material: PU Leather -Color: Blue Note:Please measure your Laptop to make sure the Case fit your laptop (Blue) Deluxe Stereo Hands-Free Headset With Mic Package included: 1 x SumacLife Bag 1 x Earphone with MIC. Brand New VanGody Collection, Durable, fashionable and functional Easily transforms into a messenger bag, shoulder bag or backpack Shock absorbent interior with water-resistant nylon exterior tapestry Multiple accessory pockets enables you to carry a wide range of devices and accessories Extra front zipper pocket for storage of chargers, cables and much more! Shoulder Strap: 33 to 55 inches Compatible with most popular 13-14 inch laptops. Approximate Internal Dimensions: 14 inches x 10 inches x 2 inches Approximate External Dimensions: 15 inches x 11 inches x 3 inches Color: Gray Package Included: 1 x VanGoddy Bag. Brand:VanGoddy VanGody Collection, Durable, fashionable and functional Easily transforms into a messenger bag, shoulder bag or backpack Shock absorbent interior with water-resistant nylon exterior tapestry Multiple accessory pockets enables you to carry a wide range of devices and accessories Extra front zipper pocket for storage of chargers, cables and much more! Shoulder Strap: 33 to 55 inches Compatible with most popular 15.6' laptops.

Spider 11/13/15-inch Laptop Bag For Macbook Pro 13

Approximate Interior Dimensions: 16 inches x 11 inches x 2 inches Approximate Exterior Dimensions: 17 inches x 12 inches x 3 inches Color:Black Package Included: 1 x VanGoddy Bag. VanGoddy Slate Messenger/Backpack with Adjustable shoulder straps Two front zipper compartments for all your necessities Interior mesh pockets, zippered pocket, and padded laptop compartment Padded mesh handles and backpack straps for comfortable wear 3 carrying options: hand carry bag, messenger bag, or backpack Hide-away zipper compartment for backpack straps and belt clips Earphone slot for hands free use of earphones while device is stored in bag Shoulder Strap: 33 to 55 inches Compatible with most popular 15.6 in laptops. Approximate Exterior Dimensions: 17 inches x 12 inches x 3 inches Approximate Interior Dimensions: 16 inches x 11 inches x 2 inches Color:Gray SumacLife LED Light Data Sync Charge Micro USB Cable Package included: 1 x VanGoddy Bag 1 x LED Light USB Cable. Brand New VanGody Collection, Durable, fashionable and functional Easily transforms into a messenger bag, shoulder bag or backpack Shock absorbent interior with water-resistant nylon exterior tapestry Multiple accessory pockets enables you to carry a wide range of devices and accessories Extra front zipper pocket for storage of chargers, cables and much more! Shoulder Strap: 33 to 55 inches Compatible with most 13-13.3inch laptops. Approximate Exterior Dimensions: 14 inches x 11 inches x 3 inches Approximate Interior Dimensions: 13 inches x 10 inches x 2 inches Color:Blue Package Included: 1 x New Bag. VanGoddy Slate Messenger/Backpack with Adjustable shoulder straps Easily transforms into a messenger bag, shoulder bag or backpack Shock absorbent interior with water-resistant nylon exterior tapestry Multiple accessory pockets enables you to carry a wide range of devices and accessories Extra front zipper pocket for storage of chargers, cables and much more!

Spider 11/13/15-inch Laptop Bag For Macbook Air

Shoulder Strap: 33 to 55 inches Fit for most of 15.6' laptops. Approximate Interior Dimensions: 16 inches x 11 inches x 2 inches Approximate Exterior Dimensions: 17 inches x 12 inches x 3 inches Color: Gray Black SumacLife Wireless USB Mouse Package included: 1 x VanGoddy Bag 1 x Wireless Mouse. Carry and protect your devices in style and comfort with this Heavy Duty Nylon Messenger Bag Made with high quality new Water resistant material and heavy duty stitching Large Main compartment and removable divider for your devices Large zipper and padded compartment with security straps Luggage strap provides secure and easy of carrying for the active traveler External strap allow you put the bag on the luggage Adjustable and Padded Straps for comfortable wear Be fashionable, comfortable, Dustproof,protect from collision. Features accessory pockets for cables, chargers, external keyboard, mouse,etc Take your device anywhere. Fits for most of 15.6in laptops Internal Dimensions: 15.5 X 11.5 X 2 inches External Dimensions: 16.25 X 12 X 3 inches Color: Black.