early next year I am heading over to Europe to visit a good friend. He isn't from a major city so there are a few layovers at different airports and a bit of a final drive to get to his place. He loves smoked salmon and I was planning on making a batch for him. I would then vacuum seal the finished product and will wrap it in a few ice packs. The ice packs won't last the entire length of the journey since the ice packs and salmon won't be in an insulated cooler. Due to the smoking process and the fact that it's vacuum sealed, would it be safe to consume after a 18-20 hour journey before it can hit the fridge?