I have the BPS backpack that I carried for co-angler use and I still use some for bank fishing. It is ok and has held up, but I'm looking at other options because I don't like only being able to fit four 3600 size trays in it. I always ended up with a 3700 size that I use to store crankbaits sticking out of the top compartment. For a while, I just loaded up my Maxpedition Typhoon with two 3700 trays and plastics and carried that bank fishing, but it was really stuffed in there and kind of a pain to get stuff out. Any pack will do as long as it meets whatever size and organizational requirements you may want. For something purpose built, I would check out the links below. I picked those two and am considering trying one of them because I prefer the 3700 size trays.
https://www.tacklewarehouse.com/Flambeau_Heritage_5007_Backpack/descpage-FHBP.html
https://www.tacklewarehouse.com/Lews_Mach_HatchPack_Backpack/descpage-LMHPBP.html