See Definition for spyris { [G4711]}
See Definition for kophinos { [G2894]}
These words in the N.T. are used with an evident purpose to
discriminate between them. The distinction, however, does not seem to
have been chiefly one of size, as some have thought, but of use.
spyris is usually a basket for food, a lunch-basket, a hamper,
while kophinos is a more general term for basket. The
descriptions of the two miracles of feeding the multitude use always
different words in the two cases, see e.g. Mr 8:19,20.