Concept of an Ovo-pack.
The Ovo-pack (オヴォ・パック, Ovo pakku?) is a portable energy battery used to charge and power various machines in Final Fantasy: The Spirits Within.
Shaped as cylindrical metal canisters, the energy within is a type of Biotic-energy created through the sciences of Bio Etherium.
One Ovo-pack was notably used in conjunction with the Wave Theory to generate an opposite wave pattern to that of the Phantoms' in order to defeat them.
Ovo-packs are manufactured in a wide range of sizes for different needs. Tiny mono-cellular organisms are grown rapidly, their simple but robust bio-etheric energy is then collected and channeled into a usable form.
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Concept art of a bio-etheric mass which would be placed within an Ovo-pack