I was using other non acr mods for a while but wasn't really working for me. Too much faf.
Currently happy w new setup on my 6ts of all internal pockets.
https://www.bagjackshop.com/en/baicyclon-inr-pct-l_903_2331 - this is the L one
So i have 1 x large across the back 2 x small on the sides and 1 x med in the front. Means i can pack all the fiddly bits cables, kindle, chargers, sunglasses etc etc down the sides whilst still having the main compartment for jackets and quick use stuff. Saves rumaging for ages also means you fit size req's for flights which is handy.
+ Nice and cheap alt