bulging, heavy
bulging sacks of toys

burlap (AmE), gunny (AmE), hessian (esp. BrE), leather, paper, plastic
flour, mail, potato
refuse (BrE) (garbage bag in AmE)
bivvy (AmE)

empty, fill
They filled the sacks with potatoes.

carry, drag, haul, heave, pull
carry sth in, put sth in

be filled with sth, be full of sth

lunch (AmE)
race (= a race in which the competitors jump forward inside a sack)

in a/the sack
sack of
a sack of coal
two sacks of groceries (AmE)

get (BrE, AmE)
She got the sack after 20 years of service.

give sb
be threatened with, face
Hundreds of postal workers are facing the sack.

hit
I decided to hit the sack (= go to bed) and have an early night.

in the sack
He caught them in the sack together.