Reusable steel kegs have the lowest carbon footprint for wines served BTG on-premise. PET keg marketing will often make misleading claims they are recyclable, however, most ‘recyclable’ products are not actually recycled due to the limitations at waste management facilities.
A quick online search will verify that amber-colored PET is generally not recycled because there is a low economic return, and the costs to recycle them outweigh the benefits.
Disposable kegs (including bag in kegs) are constructed with multiple types of plastic that cannot be recycled unless carefully deconstructed. The reality is, most one-way kegs either end up in landfills, are chipped, or are incinerated. Ask any disposable keg supplier and they will likely reiterate the same.
With a mission to reduce waste, reusable steel is the only package we can stand by for serving wines on tap.