I have decided to jump on the bandwagon and get an LV Speedy. Now, I just need to pick the size. What do you guys think? I saw the 25 in person and I think it will fit all of my stuff, but I am used to bigger bags. (I have an MJ Stam and and medium Muse.) Those are fairly decent sized bags. So, would I like the 25 or the 30? I am worried a bit about how the bag sags with weight. Does the 25 sag less than the 30? Sorry for all the questions. Thanks in advance for your help.