yea, all genesis style tanks will leak on thier side (if left on thier side too long anyways) due to their design. For crying out loud, a majority of them have a open hole in the deck XD
But, if its of any reassurance, my kraken was somewhat on its side with a full tank in my pocket for a 20 minute motorcycle ride in my pocket without any leakage. So unless you leave it on its side overnight, I'd say yer a ok. But its definitely not a purse friendly tank for sure.
Next stop is hybrid genesis for me, gonna get a silver dog