I have had several Tuttos. I have never had an issue with the fabric. I did break one of the folding pieces of the frame, but they sell replacement parts. What I learned from that is to never pick up the bag at those points. If you lift the frame on the tubing, it works just fine.
One of the owners of a LQS that I used to go to would travel with her FW in a small Tutto. She flew places with it and never had a problem.
I have one for my FW and one that I use for both my Singer 301 and my Janome 8900, since they are similar in size. I switched from the smallest Tutto for my FW to the one made for Sergers (not the soft bag), which works perfectly because I can carry my "tool" bag, a small project (baby quilt size), and my Omnigrid case that holds a 12 x 12 Olfa rotatiing mat, a rotary cutter, scissors, and a 12" Creative grids ruler. Mine are red (XL for Singer/Janome) and purple for FW.