Vacusealers weren't in common use back when I was putting up a lot of coyotes. If I was short of stretchers and/or time I always fleshed them and turned them fur side out, rolled them from the tail to the nose and put a little string loop through the nose. They went into a 2 gallon zip lock (or a 1 gallon for a smaller coyote) until I had time to finish them or got some boards freed up. Rolling them tail to nose and having a loop let me hang them up easily to thaw.
I've used a vacusealer a few times on fur since I moved to Alaska. They work great. If I was going to store long term, I'd flesh the hides first before vacusealing, just to mitigate the possibility of any slippage from freezer burned fat. For a few days or even weeks you'll be fine. I'd be curious to hear from some fur handlers as to whether they've seen slippage from fat on unfleshed, vacusealed hides, stored long term.
I've had hundreds and hundreds of hides through my freezers over the years, right next to the deer, elk and moose meat. They never once infected the meat with any horrible disease, or any minor diseases for that matter. Luckily I married a hillbilly girl who was never bothered by dead critters in the freezer.