Perhaps the peppers were placed in a larger container for pickling purposes.
Perchance by a purveyor of pickled produce from whom Peter pinched them.
A peck is a unit of measurement of volume equivalent to 8 quarts or 2 imperial gallons, so he must have brought a fairly large container to put them in.
Also, spare a thought for Peter's poor girlfriend.. After eating 2 gallons of pickled peppers Peter's pimply posterior was probably particularly pungent.
the world may never know
Peter Piper picked these with his pecky pinking pingers.
Hmm... I think maybe that a peck is four and maybe where he lives it rains pickled pepper juice?
Whats a "peck" for that matter? What unit of measurement is that? Metric?
Peter Piper is a human/bird hybrid.
1. a dry measure of 8 quarts; the fourth part of a bushel, equal to 537.6 cubic inches (8.81 liters).
2. a container for measuring this quantity. Abbreviation: pk, pk.
3. a considerable quantity: a peck of trouble.
1250–1300; Middle English pek < Old French < ?