I came across these little Caribiner-ettes recently and I have been using them to keep the Zipper Pulls together on the Synapse.
Not a lot of security but they are Gated with springs and I know I can't get past them quickly even holding the bag in front of my face!
Going through Airports recently I feel more confident using them for sure and while on the sceening belt they will not let the zippers open unless planned.
The Bottom compartment is unfortunately on its own though?
I am working on it.
Oh and the Big ones are fun too!
S-Biner | Nite Ize