We are on a very special family trip to Japan at Easter and I'd like to buy my 13 and 14 year old boys some cool Japanese inspired stocking fillers. Other than the ubiquitous snacks and sweets are there any ideas for things i could get get them - best of all things that they could 'use' there.
For example my dad came across notebooks for Eki Stamps which are amazing although I'm slightly worried about finding the stampers in hectic stations when we are travelling with luggage.