Sneak a spear though tsa
Your item blinks from existence, only to be resummoned by your will. You can only hide one weapon this way, but that will be all you need
You may hold up to 5 Objects in your stash, each no larger than something which Fits Inside A Messenger Bag (10 liters).
Storing or withdrawing items from your Stash requires an Action but has no Exertion cost.
Containers of multiple objects may be stashed only if the objects within are generally packaged together. For instance, you may stash a clip full of bullets, a medical kit full of medical supplies, or a box of crackers, but you cannot stash a backpack full of miscellaneous equipment.