A fake battery to camouflage your geocache as an everyday item. Whether you hide it on its own, or put it in the battery compartment of another object (without electronics to prevent leaching) so it's harder to spot, this will make a non-typical hide.
You can download a printable log sheet template for these containers here.
Please note that due to its size, this item will require Canadian orders to be sent as a parcel, which could significantly increase the shipping cost.