It's not a problem but when I buy an iced tea - weather it's 500 millilitres or 1.5 litres I am used to buying it with a big neck.
Recently Lipton have been selling their 1.5 litre ice tea with a small neck. Now that is just a minor thing but it's enough for me to start buying other people's iced tea.
Apparently the Real Iced Tea Co still put a big neck on all of their bottles. Simple stuff - who made that call?