If you've mentally moved on to fall like I (and possibly Hailey Bieber) have, I'm here to fill you in on one of my favorite topics when it comes to fall fashion: It bags. The beauty of it is that even though it's still boiling hot outside, you can get away with wearing a fall bag long before, say, a coat. Hailey Bieber knows this, as she was out earlier this week in Santa Barbara wearing denim shorts and yes, fall's buzziest It bag.

The bag in question is the Saint Laurent Le 5 à 7 Leather Hobo Bag. It's hardly surprising that Bieber is already wearing it, given that she's a big fan (and ambassador) of the brand, and the bag is perfect in every sense of the word.

It's compact but still big enough to hold everything you need, the signature YSL logo at the clasp gives it major vintage appeal, and it's as timeless as it gets. Plus, its hobo shape makes it very trend-forward, No wonder I've been seeing it all over my Instagram feed, and now that Bieber's given her stamp of approval, prepare for it to sell out everywhere before fall actually arrives. Scroll to shop it for yourself before that happens.

On Hailey Bieber: Alessandra RichOversized Brushed Tartan Knit Cardigan ($1125); Bode Off-White Cotton Net Shirt ($435); Saint Laurent Le 5 à 7 Leather Hobo Bag ($1690); Eb Denim shorts; Nike Air Force 1 Sneakers ($90)

On Hailey Bieber: Stine Goya sweater; Saint Laurent Le 5 à 7 Leather Hobo Bag ($1690); Nike Air Force 1 Sneakers ($90); Anine Bing Jeremy Baseball Cap ($49)

Next up, the designer bags that will hold their value in 2021.