Resealable plastic bags for liquids on aircraft

[jonno]

I use the bags from Mercadona - Bolsas Congelacion - they  are 17cm x 22 cm - but not really for liquids.

[robber]

You can buy them in the pharmacyshop at San Javier airport. Last time I needed it anyway.

[ginger]

Help please. Is there anywhere you can buy these locally to comply with the 20 x 20cm regulation. Or are they available at the airport (San Javier) before you go airside?
Flying out Wednesday and have lost ours!!

Many thanks.