Synonyms for Container:

n.

catch-all, envelope, mold. bag (noun)
pocket, gunny sack, bag, pouch, saddlebag, school bag, purse, pack sack, handbag, sack, satchel, reticule.
case (noun)
coffer, folio, quiver, carton, canister, cedar chest, crib, file, rack, holster, socket, scabbard, hutch, capsule, sheath, portfolio, casket.
container (noun)
case, drum, bottle, drawer, cup, tray, vat, cask, crate, suitcase, belly, bowl, box, holder, jug, cupboard, stomach, receptacle, jar, tank, bin, cabinet, flask, ladle, reservoir, shelf, chest, wallet, barrel, repository, locker, storage, bladder, vault, closet, can, basket, bucket, trunk, decanter.
crucible (noun)
cauldron.
holder for physical object (noun)
flask, package, canteen, jug, kettle, alembic, crate, jar, storage, pouch, bottle, pod, bunker, tank, magnum, receptacle, sack, casket, bowl, cask, dish, sac, chamber, vat, scuttle, carton, ewer, tub, chest, hutch, box, vessel, purse, cauldron, bin, hamper, bag, bucket, repository, capsule, pail, packet, vase, canister, crock, can, pit.
pot (noun)
pan.
receptacle (noun)
envelope.

Other synonyms:

vessel, package, packet. canteen, chamber. mold, catch-all. bin
bunker.
bucket
pail.
jar
crock.
keg
tub.
plate
dish.
sink
basin.
Other relevant words:
envelope, tub, package, chamber, sac, magnum, cauldron, pod, pit, dish, scuttle, packet, crock, vase, pan, hamper, catch-all, kettle, pail, canteen, ewer, vessel, alembic, bunker.