Generally, I take a bunch back to local labs, which – usually - happlily accept them for recycling (They're not accepted by NYC's Sanitation Dept. for recycling - wrong size).
But I've been more active in writing film manufacturers about coming up with alternative packaging for film. I wrote to Ilford a few years back about expanding their use of plasti-foil-wrapping for their 35mm film (as they do universally with MF film). At the time, they only sold 35mm film wrapped this way in special three-packs; now they do this with 50-roll packs of film (I have a box of HP5 which came this way, and most of their other films come this way as well). This is not only less wasteful, but, IMO, more convenient – I can pack more film in the same space without pulling the cassettes out of their containers, while stashing the wrappers away for proper disposal ("take nothing but pictures, leave nothing but footprints", and so on). Probably a cost benefit to Ilford as well, making this a win-win-win.
Barrett