Glastonbury organiser Michael Eavis has urged music fans to "drink much less" at the event which is due to get under way in just under a fortnight.
In past years, festival-goers have pushed wheelbarrows and trolleys loaded with alcohol on to the site at Worthy Farm in Somerset but have been told by festival staff that they will only be allowed to bring what they can carry.
Mr Eavis has now said that people should only take as much as they will drink themselves, regardless of how it is transported.
His advice, posted on the Glastonbury Festival website, appears to contradict a message emailed to ticket holders on Thursday morning.
The email reads: "You must be able to carry your alcohol yourself, without using any wheeled devices, including trolleys, wheelbarrows and wheeled suitcases. Any alcohol which is brought to the gates using a wheeled device will not be allowed in, and may be confiscated."
No glass bottles are allowed on site and any alcohol brought to the festival "must be for personal consumption only", it adds.
Mr Eavis wrote: "In reference to the email about alcohol that went out to Glastonbury 2013 ticket holders this morning, my personal preference is for people that come to our festival to drink much less!
"However, Glastonbury remains the only major festival that allows people to bring their own alcohol in, and you are still OK to bring your own alcohol through the gates, providing it's just for your own use (whether it's on a trolley or not)."
Fans took to Facebook to thank Mr Eavis for clarifying the situation, with one writing: "So we're ok to get well and truly trollied then?". But some said they are confused by the "mixed messages".
A scheme is being launched at this year's festival allowing anyone who looks under 21 to show their ID to staff once in exchange for a wristband that proves they are over 18. Gates to the festival, which features a headline performance by The Rolling Stones, open on June 26.