Look for Intel Core i5 processors in midrange systems, with Core i7 U, HQ, and HK processors in higher-end gaming laptops. The H-series processors are higher-power, and tend to show up in bigger, thicker laptop models, while the low-power U-series chips are designed for thinner, more portable machines. They are quite different, in terms of thermal profile, as well as overall performance potential; a U-series Core i7 processor may not even have the same number of processing cores as an H-series Core i7 chip.
At this point, the major mouse makers' software packages have been through generations of refinement, so they are slick. Logitech Gaming System (LGS), Corsair Utility Engine (CUE), and Razer Synapse are three of the best-regarded mouse- and keyboard-control utilities that cater to gamers. All offer advanced tweakability, with CUE regarded by many users and reviewers as the deepest, but also the trickiest to master in-depth.
That said, there are still some basic conclusions to be drawn about graphics performance. In general, the higher the model number within a product line, the higher the 3D performance. So an Nvidia GeForce GTX 1080 generally produces higher frame rates and higher-quality graphics than an Nvidia GeForce GTX 1060 or GTX 1070. A single high-end discrete GPU will let you play the latest AAA gaming titles on a 1080p screen with all the bells and whistles turned on, and be fine for entry-level VR play. Adding a second GPU (a rare and expensive option) will let you run the latest games more comfortably on 4K and 5K displays, or let you hook up multiple monitors to your laptop.
If you’re using your laptop to play games, you need to keep your laptop plugged in to get the full performance out of your GPU. And if you don’t, you’ll be lucky if your laptop lasts an hour gaming. In our testing experience, most gaming laptops last only a few hours on a charge when performing other tasks, but never as long as ultraportables without discrete GPUs. If you need something to last 8 hours while you work, it won’t be a gaming notebook.
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.