Large mesh cheesecloth? Straining pulp (not juice) from plums for jam
I use nylon straining bags for making wine. You can get them in various sizes at homebrew stores. (for example: http://www.midwestsupplies.com/nylon-straining-bag-18-x-32-coarse-mesh.html) I'm sure they'd do the trick for what you need. Although this may only work for passing juice, you might inquire at your local homebrew store if they have a slightly larger mesh size.