You need to invest in a great beg that looks like a purse. I have this bag 
PetEdge: East Side Collection Croc Pet Carriers   in size small and My Jeter is 19 months old and is 2 1/2 pounds with plenty of room to move about in it. I have been able to sneak him into  quite a few places that I know do not allow pets. No one knows that he is in it!