These velcro straps work very well for soft bundles, like a jacket or layers. I have a mesh stuff bag that keeps everything together, and doesn't fill with air when I roll it up.
REI straps

I have the 18 inch straps for small bundles, maybe 4 or 5 inches in diameter, and the 24 inch straps for somewhat larger bags. The hook ends stick anywhere along the strap length. The straps don't stretch, so they are great for keeping the bundle in place. I can pull the strap really tight, and stick it down.

The 4 inch velcro hook end has to be folded back and stuck to the rest of the strap, so the largest circle of a 24 inch strap is about 6.5 inches. Using two 24 inch straps end-to-end, they make a circle anywhere from a little more than 12 inches down to about 8 inches.