u/Self-Chance

So im using a 5L saddle bag for my commute to work on my infinito with a X1 U lock inside towards the very front of the bag and some clothes and a towel. It has some weight to kt mainly the lock (3.7Lbs). The bag has 3 points of harnessing and my seat rails and seat post is metal. Is this ok on the frame or should i carry a back pack.

Getting back into riding after 3 years of not riding when I did it before for about 2 years. I love cycling and Im happy im back in this. Always wanted a bianchi since the day i got my first bike and saw one hanging and now here it is.