bag cup pouch expander/ coaster

this is the first functional model I have ever made, it is a coaster for when you need it and to keep mugs and cups off the ground. It also helps support the bottom of a cup pouch on a backpack and whatever else has one. all you need to do is put it in through the top and lay it flat, it will help support the cup/ bottle and could help take a couple impacts from damaging said cup/ bottle. I did put my initials in the bottom in the shape of pi because I think it looks cool.