I have had these leaking issues with the 1000ml gallone bottles as well. Easy to over tighten cap and it leaks. Cap gets soft from hot syrup and it leaks. I think the thread engagement length and material of the cap are problematic. Really love the look of these bottles but the caps are VERY annoying. I had SLIGHTLY better luck with the golden caps with the tamper evident ring. They came in an order thru bascoms early this year (unprinted 1000ml stock). I found just barely tight enough and on side but slightly elevating the bottle neck/cap helped.