If your laptop is more than 12 inches, don’t get the Slim Backpack!! Day Owl needs to update the descriptions bc I have a 14 inch laptop, but it doesn’t fit in the slot of the Slim. The Backpack works perfectly though! I’m very pleased and easily got the Slim exchanged for the bigger version. The water bottle pocket (water proof w/ a zipper!!!) is so cool and my bottle fits perfectly (34 oz stainless steel Waterdrop brand). I 100% recommend this backpack, do buy if you’re searching for a new backpack. Great company and great quality! Wonderful customer service as well :D