I have been using the Ikea VARIERA 701.548.00 Stainless Steel Pot Lid Organizer as a bag holder for a while with no rust at all. The accordion style allows you to adjust it to fit your container and bag width because I switch between a 12 Qt Cambro and Coleman 24 Can stacker. The organizer works great for keep the bag separated and upright, but I was still having some issues with floaters. I had used clips but thought there had to be a better way and this is what I came up with.
The addition of some 1/4 inch I.D. tubing from your local hardware store makes a great upgrade and it only cost around $3.
I cut 2 lengths of tubing to form handles on each end of the organizer making sure the length of tubing formed a handle that would sit just below the lid of either my 12 quart cambro style sous vide container or the 24 quart Coleman stacker cooler that I use for longer cooks. I used a heat gun to soften the tips of the tubing so it would stretch over the tips at each end of the organizer.
I cut a 3rd length of tubing that I fastened to one handle tight with a zip tie. I made the length so that when the organizer was stretched out fully I had enough length to wrap around the other handle. I used another zip tie put on loosely so the tubing can be squeezed in and out of it allowing me to adjust the length, yellow zip tie in the picture. This piece of tubing allows acts as a hold down across the bags to prevent them from floating up.
Using this setup I am able to arrange all the bags at once outside the hot water bath, fasten them in place, and then lower them in all at once. It also allows me to remove them all at once from the hot water bath. The tubing handles are cooler than the stainless steel to the touch and are much more comfortable to grab at the surface instead of having to reach into 150 F water quickly with bare fingers or with tongs.
This Variera pot lid organizers go fast!