Please refer to following size list,the dimension is laptop's.
If you are not sure,please feel free to contact with us.
Following Size is Laptop Dimension,please refer to it for choosing fitting bag.Thanks

11.6 air: 300×192×17mm
12 inch air: 280.5×196.5×13.1mm
13.3 air: 325×227×17mm
13.3 retina: 314×219×18mm
13.3 pro: 325×227×24.1
15.4 retina: 358.9×247.1×18mm
15.4 pro: 364×249×24.1mm

And the bag may be a little bigger than laptop,when your laptop is not Apple Macbook laptop.

11 inch sleeve
Asus Vivobook E200HA: 286 x 193.3 x 17.5 mm
Huawei Matebook:278.8 ×194.1 ×6.9mm
Surface Pro 1/2 with keyboard: 274.57 ×172.97 ×13.46mm
Lenovo Yoga3 11; 290 ×197 ×15.8mm
Lenovo IdeaPad 100s: 292×202×17.5mm

13 inch sleeve
Surface Pro 3/4 with keyboard: 292.1×201.42×8.45mm
Dell XPS 13 Series: 304×200×15mm
ASUS ZenBook TP360CA：323×220×13.9mm
Lenovo thinkpad x250: 305.5×208.5×17.7 mm

15 inch sleeve
Lenovo IdeaPad 500s/700s: 338×232×13mm
Lenovo Yoga 2/3/4 Pro: 330×220×15.5mm
Asus U305/U303L Series: 323 ×226 ×12.3MM
Lenovo Thinkpad X1`Carbon: 331×226×18mm
DELL VOSTRO 5459：337×233.5×18.3mm
Lenovo thinkpad T460: 339×232.5×21mm



Wool felt as the external skin, thicken and soft, a nice dust-proof & scratch-proof laptop mate
Practical design and exquisite workmanship; Environmentally friendly material. Sustainable, renewable and biodegradable
There are 2 pockets on back for your convenience to keep smartphones , earphones , credit cards , pens , etc.
Neater and close treads and stiching on every edge , no worrying about loose or off-line treads.
Lining material is mold-proof, wear-resisting and does not scratch the computer;
Felt absorbs shock and protects your device at all times.
Micro fiber as liner, very amazing touch feelings and no worry about scratches on your device anymore.