Reversible one-skein mesh bag stretches to carry a lot of groceries, but not so many you can’t carry it home… Long handles can go over the shoulder but don’t stretch into infinity. Reinforced openings, I-cord handles, and an easy mesh-stitch make a sturdy but quick project. Rolls up to fit in pocket.
I place this pattern in the Public Domain; use as desired, including to produce items for sale.

Measurements:
Bag body: 17” wide by 11” long, unstretched (larger when stretched).
Handles: 22” circles

Gauge: Exact gauge is not very important; mesh stitch is very loose; I-cord is pretty firm.

Materials:
1 skein Simply Cotton Organic Sport, knitpicks.com, 50g / 164 yards
#10 needles or circular needles
#2 DPN (2) and E crochet hook