I have the Jason Wu for Target canvas satchel and it surprisingly fits so much more than I thought it would. It even has a middle pocket for a laptop, and it’s really well made for being a diffusion product. They’re obviously sold out in stores but I know there are plenty on eBay! 

I also have the 15” Cambridge Satchel in vintage brown, but it is very structured and I’m not sure if it would fit your laptop. I recommend it to anybody that is looking for a nicely made school bag, however. I get so many compliments and it’s probably my favorite bag that I own. Here are a couple other options that I hope you’ll like -

• Park Lane Native Print
• ASOS Leather Old Boy (brown version)
• ASOS Canvas Satchel
• ASOS Double Buckle Retro Satchel (brown version)
• Madewell Leather Caravan Satchel

I know that a majority of these options are for men, but I think they designs are gender friendly and I actually preferred them over the women’s choices. The last option is a little over your budget, but I loved it too much not to include it. Hope I’ve helped!