I have decided to only pump and give my son bottles due to latching issues. He is 6 weeks old. I know this will require washing more bottles and tubes,but it's stressful having the latching issues. I have a good breastpump and lots of tubes and freezer bags and Avent bottles. What are other things I should invest in? Do I use a bottle bag for when I go out? What do I use for when I do go out and want to have milk on hand ready to go and feed him? Any advice is appreciated!