Surge Commuter Laptop Backpack

I'm distinguishing between the sleeve within the main compartment of the 2DAP and something like the TNF Surge where there's a different zipper and it has depth whether you put a computer in it or not. I found it much harder to use that backpack for odd-shaped stuff, like my lunch.

I have been using this version https://backpackies.com/s/nfsg.png since 2020. It definitely gets hot. The padded back panel provides little ventilation, soaks up sweat, and stays damp, leaving my back completely soaked. To cope with this, I sometimes wear the bag on my chest to let my back breathe,