UntilGone offers the Taikes Expandable Water-Resistant 15.6" Laptop Backpack in several colors (Black pictured) for $16.99. Coupon code "TAIK-AFS" cuts it to $15.99 and bags free shipping. That's $4 under our September mention and also the lowest price we could find now by $4. It features a 2" expandable layer, two main compartments, and padded back panel and shoulder straps.
Some of the changes we've made amid the COVID-19 outbreak are likely permanent.