A used 1 litre square HDPE plastic bottle with Lid. This has been used, may have a little carrier oil in and may come unlabelled or with an old label (as per the photo). It will have a lid but the tamper evident part maybe be missing (as per the photo). They are ideal for storing larger blends.
We have these spare from local customers bringing in used bottles to recycle or from where we have had to rebottle an item.