So far I haven't found an alternative for freezing big chunks of meat or veggies (in portions that make sense for 1-2 people) in the freezer without using plast

So far I haven't found an alternative for freezing big chunks of meat or veggies (in portions that make sense for 1-2 people) in the freezer without using plastic bags or plastic containers - any alternatives? As for water bottles, I'm a fan of the stainless steel klean kanteen with the bamboo cap