D&Dverse bags of holding, Harry Potter bigger-on-the-inside storage, even Mary Poppins bags--agents carry them; they're useful. Technically, you can even use a plot hole itself for storage, but I imagine DoSAT would have to stabilize one similarly to the ones used for transportation, so you could actually rely on using it for storage rather than randomly opening up into the girls' locker room or something else equally embarrassing.

If there's a canonical way to activate such an effect without being a magic-user proper, go for it. If you can write a backstory about such an effect having been created by badfic, ditto.

Otherwise, I would go for a garden-variety bag of holding, perhaps created by a DoSAT employee mucking about with the "Connect" spell effect.

I think your question is mainly related to whether this is OP for an agent? Well, first of all is the useful rule of thumb that goes, 'if you have to ask whether it's OP or not, it probably is'. Second, you might want to look at this thread, which deals with a similar subject (how to figure whether a Sue is OP or not).

On a different note, please touch up your SPaG. As per article 11 of Da Rulez, "Thou shalt make thyself legible. Spell correctly and use good grammar to the best of your ability — remember, the PPC is a force for good writing, and that includes SPaG."

Although I don't have an answer for that, I have a solution:

If I manage to obtain the Permission before you, my agent can make yours a spell, which would enable him to summon objects from the Hammerspace. We can work out the details later...


So, wanna make a deal, kid?

Valon's vest is lined with Bags of Holding. I imagine that you can always find creative ways to keep all your gear with you.