Ok before I hit the hay. You can turn into an animal at will. Your clothes and such won’t turn with you but mass is not conserved so you can turn into something much bigger or smaller. It has to be a real creature that does or has existed and I guess if you want a plant that would be fair game. For me its an albatross. could travel around the world. might even manage to carry something that is not to large if packaged right. I am a bit torn though as the ocean is large so maybe a sea creature would be better. like a killer whale. of course then its not great for getting somewhere inland.
first thought is fruit fly but no gotchas so when you turn back you won’t be incredibly old or anything. the transformation will not help you stay young or get old fast as a human but I guess if you stayed in fly form to long. that could be bad.
I think staying in fly from sounds exactly like what I’m looking for. I guess I missed the whole turning back into a human part. As long as there’s not some bullshit reincarnation clause or something.