The milk bottle is from polyethylene terephthalate (PET) resin, which is is lightweight, shatterproof, reclosable, resealable, reusable and recyclable.
There are a wide range of solutions that can be used to increase the shelf life of capsules, tablets, pills and other pharma products. Among these are PVC, PCTFE, PVDC and thermoform blisters for less sensitive products or Alu-Alu cold form blisters for APIs that are more sensitive.