I have been using a bag like this for years, MARINE SPORTS Dive Bag with wire Handle at West Marine
. It is not a durable as the other drag bags mentioned, I bought it in the late 80s for diving. I started using it as a drag bag 7 seasons ago and finally replaced it last season because the metal handle bent and was easy to close but hard to open. (bad combination holding my beer hostage) The mesh held up well over the years. There are a few small rips, but nothing major. I clip the handle to a d-ring. The bag and cans stay in the water while being held close to the raft and out of the way of the oars. I just bought a new bag last season, the new bag has a plastic d-ring sewn into it, I don't trust it though.
Easy to open handle
Easy to see through so you can take stock in your supplies
Perfect bag for storing your cam straps before and after the trip.
Lightweight mesh is prone to tearing if abused
Easy for kayakers to sneak up and grab a beverage