Return of TTV Pies

[Ed Venture]

Why can you make them into pies in the first place? That's really odd to me.

Baking TTVs into pies would allow you to essentially carry backpacks full of potentially 11x11 explosives. There's a reason why you cannot put regular TTVs in your backpack in the first place.

I know that what I am asking is why would be able to make it into a pir in the first place. Seems odd that there is such a loophole around it.