[quote=@Leolycan]
If the limit is three items, it can be assumed that Vex's three are his two swords and his armor. If not, Gasmask, Comlink, and Handcuffs.
[/quote]
Since his swords and armour are all purchased upgrades and part of his actual character design they don't count as optional extras so he can take three extra items on top of them. Also the [i]Commlink[/i] doesn't count as a carried item either, since it's basically just an earbud, so you could take one more thing as well.