This is what it looks like with 2 solid keeper lings and 3 BIG BRF in it:

SWEAR TO GOD SAME.

Well, sorta.

I've caught fish since owning it, but if i take my old costco bag out on the kayak = fish! If i take my new-to-me PFG bag out on the yak = no fish day.

Best way to keep any fish after killing it is laying it flat, not bent.  Laying the fish straight after it dies reduces the amount of separation in the flesh that results from rigormortis.  I realize you've already purchased the Columbia bag, but this Silver Horde one is great:  https://www.amazon.com/Silver-Horde-Katchkooler-II-Bag/dp/B00C500BLQ
It's cheap, can be found for $25 or less on sales, like on black Friday, and does exactly what it needs to do. I really wouldn't recommend a "catch cooler" for holding salmon that is only 28" long.