Packaging, e.g. for consumables like milk, has a special writing panel with a surface to accept writing with a general domestic non-permanent pencil or a ball-point pen
摘要
<p>A user can make a note of an opening date on packaging on a small blank panel adequate for a hand-written note of a date between six and eight characters. There is extra space for details of time. Pre-printed labels can make this even easier. A small addition like 'opened on/at' can complement this blank panel even more.</p>
