Most large brands such as Huda, Saigon, tiger, etc, have a system in place to recollect the empty bottles, except for danh thanhs bottle I have seen them in different homes collecting dust. 

Most micro brewers such as Tete, Saigon Cider, etc dont return

As for impoted beer, ginger beer, and corna a stagnant waste in bars can be reused with full rights to the collector at zero cost. Make use of it. 

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