Three statements are given followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
No card is a parcel.
All cards are envelopes.
Some envelopes are bags.

Conclusions:
I. All envelopes can never be parcels.
II. No card is a bag.
III. At least some bags are postcards.