First time I have ever tried this! Friday was the last day of a two-week long course in the Parliament. After the course was over I had to carry all the files, books, papers and stationery back to my school. So the bag would be empty on the way there but full on the way back. So I put one inside the other for the trip there. Worked like a charm.
My Michael Kors Jet Set Laptop Tote went on the inside and my Cath Kidston tote went on the outside.