As I mentioned in another post, conbini (Japanese convenience stores) often have campaigns of various types (see Snoopy towel).
Sometimes, campaigns are as simple as a small gift attached to the bottled drinks (pet bottles, ペットボトル, or often just shortened to “petto” ペット), such as teas, coffees, or sodas. Over time I have collected a fair number of these, from pet bottle covers with designs of Rilakkuma and Sailor Moon to cell strap charms of various character, refrigerator magnets, Moomin sticky notes, and even plastic cell phone stands (okay, this one was a bit odd). Sadly, yes this does in fact sway me to purchase certain drinks over others, due to my penchant for ultra-kawaii things clouding my better judgement.
I will work on uploading the whole gallery of random pet bottle gifts… but here are a few to get started.