Recent promotion in South America from Jack Daniels Whiskey.   Buy 2 bottles and get a free T-shirt as an in-pack promotion.  The perceived value of the T-shirt is very high.

It is nicely packaged so that good for transporting 2 bottles together with little risk of breakage.

ODM can manufacture custom T-shirts and textiles in Bangladesh, Vietnam and China.  Check out also dry fit options to tie in with more sporty themes.