i don’t find the opening annoying on the nano belt size. It’s magnetic unlike the larger sizes and I don’t zip it shut...feels secure without using the zipper. I can see how if you use the zipper it could get annoying to have two closures.I guess you can decide if you want a top handle or not. They are very different bags! What style do you like? I have the nano luggage and love it. Very comfortable bag, but you have to see if you are ok with the strap drop and crossbody length. My sis has the nano belt which she loves but its a harder structured bag and has an annoying opening according to my sis! Try them on and see what you like!
If you decide on the nano luggage, you can always have a cobbler shorten the strap for you....I’ve had this done before with an LV bag and no issuesIf this is a replacement of the pochette metis I chose the trio. It sits flat when worn crossbody and packs all the essentials and more. The nano luggage is more boxy and the strap isn’t adjustable. I love mine but don’t use it as much as my trio. Hope that helps