Do you know what they are changing to? Nitro pillows are from what we looked at are best way to send them from a preserving standpoint. Keeps the pellets intact and air free. This causes problems though because hard to tell if the package has been compromised. Rule of thumb without fancy equipment is if you can not smell it or squeeze it empty the package is good.
Vacuum packing grinds the pellets and creates dust in the bag that has low utilization. Compromised bags will have free moving pellets with no pocket.Presentation is much better since the brick is assumed to be perfect. Major downside to vacuum packing in Mylar is the pellets will cause micro tears in the bags, the bags have no stretch like plastic. A conversation I saw on Probrewer said you would need 9mm bags to ensure no problems. How do you pass along the price of a $2 bag for one oz of pellets?
I have tried both and will likely return the nitro module since too many complaints for the puff. Input is appreciated, this is not stuff you can learn from a class!