[Accoutrements] Item - Orb of Monster Pocket (Patreon)

No beast can escape your capture with this orb. Set off on your adventure and try to catch random animals minding their own business in the wild. If you catch them for long enough, maybe they'll even learn to use special attacks that you teach them...

In all seriousness, this is a good option for any accoutrement compendium - a good way to keep them safe when you're traveling through dangerous places.