Work with Feet or not

Hi, I have noticed the same thing...it appears to be by color that I have noticed so far but I'm not sure. For example all of the TEmpetes this season do NOT have feet, where I have seen Pommier and Ciel with feet. Anyone else have any info?
 
my work rh raisin has no feet. Is it possible they produced same type of bag and same color but some with feets and some without feets?

do the tempete also like that? some have feets and some just don't have?