It’s actually a US regulation which goes into effect on May 10th. Most other booking sites should be following suit with something similar over the next few weeks.

It’s because FTC regulations requiring fee-inclusive pricing go into effect on May 10th. Everyone dealing with short term rentals and hotels in the US will be updating to this over the next few weeks.

They use air pockets but they are of the stiffer variety that are fitted around each drive, not the super cheap and thin air pockets that just get jammed in to fill the box.