Most bulk boxes are recyclable, returnable, or reusable. The deposit system and returnable bottles started to get replaced by nonreturnable containers. Not all packaging justifies being returnable and reusable. Bulk foods, chemicals, and pharmaceuticals are often shipped in reusable and returnable containers. Glass milk bottles are glass bottles used for milk and are generally reusable and returnable. For many years, several types of shipping containers have been returnable and reusable. Returnable packaging is encouraged by regulators. Other advantages of using returnable packaging include avoiding damages to parts in while in transit. The farm's dairy plant continues to bottle milk in returnable glass containers. THB Pilsener is sold in two sizes of returnable brown bottles&colon; and . Environmentalists also praised his advocacy of solar energy, returnable bottles, and bike paths. Some are designed for single use while others are returnable for reuse. This version, which was not returnable, was estimated to have sold an additional 8300 copies. Ellis also pointed out that the units DC sold are returnable. Many potential factors are involved in environmental comparisons of returnable vs. non-returnable systems.