I didn't buy this for a laptop. I bought the 14" for my ipad pro 12.9 without a case and it's a perfect fit, safely snug but not tight. However, if you have a case then it would be best to get the 15" otherwise it will be too tight making it a struggle to retrieve in and out. It will be used to go into my personal item on the airplane. So it's safe to use as a personal item that you'll carry on the plane, but it won't provide enough protection to put inside a checked bag.If you don't know what size to get, here's my take:Get:14" for ipad pro 12.9 without a case15" for ipad pro 12.9 with a case14" for ipad pro 11" with or without a case (but if you have a case keep in mind the pocket is 10x8 so measure yours first).15" for a 15" lap top, i have HP Spectre 15" and it just barely fits in the padded sleeve portion of my 14" bag and it's hard to get it in or out. So if you have a 15" laptop get the 15" bag. If you get the 15" you can fit your lap top and also an ipad pro12, in the space next to the laptop padded sleeve.==========I don't use my bag for a lap top at all.Here's my setup:14" bag: My ipad 12.9 in the padded sleeve portion where a laptop would go and it has a sturdy strap that velcroes it secure. Then next to that there's another space that's plenty of room for a large book at least 9x11 but I use it for my Logi mini keyboard and a keyboard stand. Then there's a separate sleeve specifically for an ipad pro 11 or smaller. That sleeve is 10" x 8" (an ipad pro 11 is 9.5x7 without a case)THE SMALLER POCKET SLEEVE 10"x8.5" perfect for an ipad pro 11" (without its case measuring 9.5"x7" But it's too small to fit a 12.9 pro in that slot, so you'd have to use the laptop padded sleeve for a 12.9 ipad pro without a case (get the 15" bag if you have a case).I am able to fit my Logi mini keyboard and a keyboard stand in the section next to that. Just a note that I don't use a case with my ipad, but if I did it seems it would fit albeit snugly. Perhaps for a 12.9 ipad best get the 15". I got the 14" because this bag needs to fit into my small 15" roller bag carry on,Now, that gives you 3 great sleeves. 2 big and the one specifically for an ipad pro 11" or smaller = 3 total sleeves.Then there's a front zipper panel for accessories, charger brick, cords, pens, another cell phone, and more.Finally, there's a little slit pocket that runs horizontally across the front outside of the bag. It's about 6.25 deep, so if you have a cell phone 6" or less it's perfect. If your phone is 6.5 or 7" then it won't fit and you won't be able to zip it closed. It's perfect for my 6" Samsung and my iphone SE because both of these phones are 6" or less.I've tried 4 other laptop bags and this one is the best and holds the most.=======================CON:The only con: the color is dark which makes it hard to see in a plane on my long international flights when the cabin lights are low. However at least the interior pockets of this bag are light grey which helps make it easy to see black cords, black chargers, etc. And the zippers are outlined in black so that helps locate the zipper even in dark. I keep this bag inside a black carry on so it's a little hard to see, but at least grey is easier to see than the black one. Would really want a light grey color rather than this almost charcoal grey. But that is the ONLY con of this bag. I think this bag is GRRREAT! I am so happy I found it. None of the others fit all my stuff in it.Hope this review helps someone who is thinking of getting this. I am very happy with it.Would like to see this bag in other light colors.Black looks great I know, but it literally is hard to see in dark/low light and could run the risk of leaving it behind. My new thing is get anything but black, especially if the interior is black, makes it super hard to see black cords and black headphones in the dark. Keeping in mind the purpose and fuction of this bag for me is to use in long international flights 9-11 hrs long and when you're crammed into a close space with people on each side of you it's best to have a bag you can see what you need quickly.