The yellow jackets are always a problem unless it is really cold out they are attracted to the protein in the chicken blood. I use shrink bags but foodsaver bags will do the trick. They will keep in the fridge for a week or so I would recommend getting shrink bags they are easy to use and make the job look professional. Here is a link on the shrink bags.
http://www.texaspoultryshrinkbags.com/
http://www.texaspoultryshrinkbags.com/