It's big! Bigger than I imagined (my bad, should have read the dimensions!) Maybe a bit big and not quite right for my regular use (I swim in local lakes about 3 times a week) but I'm going to keep it for my frequent trips up "home" to Scotland where I swim in reservoirs, lochs and the sea whenever I can. It'll keep the boot of my car much more in order. I'm going to use the smaller inset bag for dry clothes and a small hot waterbottle, and continue to use my smaller "dry bag" for wet stuff. Saves having to wipe out all the time.
A couple of things I would have wanted for more regular use would be dedicated drinks bottle pockets, although I guess I can strap one on, and also the inner pocket could do with being a bit bigger. I can fit my car keys in, and a small purse of loose change ... but not my phone.
You can't fault Gorilla for quality though. A good strong bag that is capable of carrying all my swimming gear - and more!