I found this Pepsi Perfect gift set on Just Geek for £39.99 which includes Bottle, Hat & T shirt.
You might remember the Bottle from Back To The Future 2 where Marty Mcfly is in the 2015 Cafe in Hill Valley:
I've wanted this for my BTTF collection before but they're always priced quite high on eBay or hard to find. It looks as though these were exclusively made for Just Geek and were released around the 20th of October. Would make a good xmas present for BTTF fans.
If you spend over £40 you get 10% off with code CDUK10 (you'd need to add anything to your order for this to apply) or if you spend over £50 its free postage.
This worked out well for me as I ordered 2. - One to fill up with Pepsi and display and another to keep unopened for myself.