If you choose to return your container to a reverse vending machine, then your container needs a readable barcode. The reverse vending machine has to be able to read the barcode to ensure the container is eligible to be returned. This means the container can’t be crushed, faded or distorted.
If you return your container to any other type of container refund point, then it still needs to be recognisable as a container which is eligible under the scheme.
Whether a label is required for this purpose will depend on the product design. Acceptance of products without labels is at the discretion of the container refund point.