Where can I buy a small cooler bag for under $20? Most places sell it for like $50-60

Yes, Daiso has $2 cooler bag. You can put ice cubes in a sandwich bag and make it cooler. Alternatively, you can get cooling panels from Daiso too. Place the cooling panels in freezer for few hours before place in the cooler bag.

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Fairprice is selling for about $5. Daiso for about $2. You can also buy preloved at Carousell.

thanks