A lot of people I know do this. I do this usually with fabric bags because they have such a short life span…they’re not worth keeping for too long. The leather ones I keep and keep and keep. 
I know I carry a lot of stuff 
…Im one of those just-in-case type of people. I never want to be caught unprepared or off guard. I just have to have everything I need with me. Plus you waste so much time on the train (an hour commute), might as well read something useful or get some work done.
Saadia, what kind do you like? It would be interesting to see other peoples’ taste also.
I knowwwwwwwwwwwww!