I have a Samorga organizer in each of my MMs; I can't imagine using them without one. I like everything to be easy to find, and I also like that the organlzer helps the bag hold its shape a bit.
I almost bought the Speedy 30 size when I got my first, but ended up going with the NF MM sized organizer to better protect the RB lining. I can still cinch the bag; the felt gives enough to allow that to happen. If I have something firm in the end pockets (like a water bottle), then only the upper portion cinches in. I'm ok with that, and I think that would happen even with the shorter height of the Speedy organizer. I ended up getting the MM size again when I got my second NF.
Different size, but I hope this helps. I think both styles work, I just prefer to protect more of the lining from potential stains.
I almost bought the Speedy 30 size when I got my first, but ended up going with the NF MM sized organizer to better protect the RB lining. I can still cinch the bag; the felt gives enough to allow that to happen. If I have something firm in the end pockets (like a water bottle), then only the upper portion cinches in. I'm ok with that, and I think that would happen even with the shorter height of the Speedy organizer. I ended up getting the MM size again when I got my second NF.
Different size, but I hope this helps. I think both styles work, I just prefer to protect more of the lining from potential stains.