ליקוטי הדף היומי | שבת צ:

MISHNA: One who stores a seed for sowing, or as a sample, or for medicinal purposes and carried it out on Shabbat is liable for carrying out any amount. By storing that measure, he indicates that it is significant to him. Therefore, he is liable for carrying it, despite the fact that what he carried out is less than the halakhic measure that determines liability for that item. And any other person is only liable for carrying it out on Shabbat if he carries out its measure for liability. If one stored the seed, carried it out, and then brought it back in, with no intention to utilize it for the specific purpose for which he stored it, he is only liable if he brought in its measure for liability (Rav Shmuel Strashun).