包, cognate of 胞, is a pictographic character. 包 originally meant a fetus in the embryonic membranes, a meaning later replaced by 胞.
The original meaning of 包 was extended to:
1.to wrap (up)
2.a package; a parcel
3.a bag; a sack
6.to undertake; to assume responsibility for
包 serves as phonetic component to form characters.