Hey there!
Just wanted to let you know that theres a spare air valve on the back of the roll mat camping. If the rebound is slow or insufficient due to weather conditions or long periods of non-use, dont worry! The valve can be used to inflate the mattress using an air bag or electric pump. Just a friendly reminder to be careful not to over-inflate, as this can cause quality problems.
Just wanted to let you know that when storing this car mattress, you can roll it repeatedly with your knee pressed against the mat until most of the air is expelled. If you roll it only once, there may be more air inside the mat and it wont fit in the storage bag. Hope this helps!