My work just gave us all custom Herschel Classic backpacks with the company logo on them. It’s not something I necessarily would have bought for myself, but it’s amazingly comfy (padded straps) and capacious without being huge. One big main compartment and one smaller outside pocket on the front, simple. Classic Backpack 24L| Herschel Supply Co.
Our backpack for our upcoming trip in June is an “Amazon Basic”. My kids and I tested it out on a trip to our local zoo this past weekend, and it’s a great choice for 90+ degree humid heat. The pack itself has two pockets (three if you count the little inside pocket that the pack rolls into for storage), so security check should go quickly. It’s lightweight, just like a cinch bag, but the straps are a little more substantial. They are wide and flat straps (no digging into the shoulders like the cinch bags), but are also made of a net like material that breathes. Overall, this bag allowed my body to breathe under it, a concern I have with typical backpacks.