There is not just one souvenir to take back home with you. Bearing in mind we are such a culinary destination, anything realted to food & drink could be a perfect gift to buy.
Basque Gastronomy: either a bottle of txakoli white wine, or some Idiazabal cheese, or some sweet local bollos de mantequilla... the problem will be what to choose and overall, keep it wrapped and not bited!!!
Txikito glass
Txikito glass: In Bilbao and the rest of the Basque Country area, it is typical custom before lunch or dinner group of friends drink txikitos in the bars and taverns. Txikito glasses are samll, heavy handcrafted wineglasses from whitch the wine is drunk in one go. Get one and drink back home as if you were in the streets of Bilbao!
Reproductions of the Guggenheim, Puppy, Hanging Bridge
Baldosa Bilbao: The floor tile of Bilbao has become a symbol of the city and has gone from covering its streets to also being immersed in a great transmedia universe. The famous 'Baldosa de Bilbao' comes in multiple forms such as scarves, umbrellas, watches, T-shirts, and even a sweet version to bite into.