At the mid-range we see laptops with either the NVIDIA GTX 1060, or for a bit more money, a GTX 1070, both of which are a powerful gaming GPU in a mobile form factor. ASUS offers the Republic of Gamers branding Strix lineup, and the GL504 model is their 15.6-inch range. Featuring the GTX 1060 in the GL504GM, and GTX 1070 in the GL504GS models, there's a wide range of performance here depending on budget. ASUS offers either the Intel Core i5-8300H quad-core, or the Core i7-8750H hex-core CPU, and up to 32 GB of DDR4 RAM support. There's a full range of SSD choices, and you can of course also fit it with a HDD for extra space.
Dell Home, via its Member Purchase Program, offers its Dell 15.6" Laptop Gaming Backpack in Black/Red for $28.49 with free shipping. That's tied with our expired mention from four days ago as the lowest price we've seen for this bag. (It's the best deal we could find now by $20.) It accommodates laptops with up to 15.6" screens and features a shock-absorbent EVA molded front shield, adjustable shoulder straps, and a deployable rain cover.