Buy original mug , betul2 boleh tahan...
I buy ADL ice at morning 9am, put the mug at normal temperature room, until night 10pm still have ice cube yet fully cair inside the mug.

And they do really specific buyer must bring their mug...
I got reject once by bring fake Starbucks mug that sell at shopee, that time feel so malu, Hahah, then buy 2 rm168 mug at the shop. 2 mug with drink dapat keychain rm18 and free kek.