Yes, only in the Philippines.

This often happens in sari-sari stores where the storekeeper/s pours a bottle of coke (or any softdrinks) into a plastic bag and places a plastic straw to go with the drink. This is done when one wants to purchase a softdrink but does not want to be encumbered with the bottle or, one forgot to bring a bottle as replacement.

As to whether it is hygienic or not, most people don't care as long as their thirst gets quenched with the cold softdrink.