Do you have a crochet holder for this item?

Yes I have mine in one of the needle holders from amazon, it has two compartment with zippers

Are the Odyssey hooks better for pencil or knife grips?

I have a pencil grip and find them to be a tad heavy however, the shape is quite comfortable. I could see how someone with a knife grip would enjoy using them as well.

Does this have any warranty on it? My hook has a crack on the shaft and I’m afraid the hook is going to beak off.

Not that I know of...when I received my hook it came with no warranty documents..if I were you I'd maybe give Furls a call. If you recently purchased the hook and it's already breaking, it may have been defective. Not sure, but maybe as a courtesy they might just replace the hook.