I used the same canvas grocery tote for about eight months straight. Farmers market, Target, gas station snacks — that bag saw everything. Then I noticed a faint sour smell and thought, “Huh, that is probably fine.”

It was not fine. A friend who works in food safety told me reusable bags can harbor E. coli and salmonella from meat packages, produce drips, and whatever leaked from that rotisserie chicken container. The bag never touched my laundry pile. I was basically marinating my fresh broccoli in yesterday’s raw chicken residue.

The fix is easy. You just have to remember to do it.

How Often to Wash

After every trip where you bought raw meat, poultry, or fish — even if the package looked sealed. Leaks are sneaky. For produce-only or dry-goods trips, every 3-4 uses. Designate one bag specifically for meat to make tracking easier. I use a red canvas tote — it never holds anything but packaged meat, and it goes straight to the laundry pile when I get home.

Washing Instructions by Material

Canvas and cotton bags: Machine wash hot with regular detergent. Dry on high heat — the heat does as much sanitizing as the soap. No fabric softener; it reduces absorbency which you want for soaking up minor leaks.

Insulated bags: Wipe the interior with a bleach solution (1 teaspoon bleach per quart of water). Let it sit 2 minutes, then wipe with plain water and air dry. Do not submerge insulated bags — the filling turns into a mold sponge.

Nylon or polyester totes: Machine wash cold, air dry. Heat melts the synthetic fibers and they lose their shape.

Plastic-coated or laminated bags: Wipe down with hot soapy water, rinse, air dry. These are the easiest — 30 seconds and you are done.

Storage Between Washes

Do not ball up damp bags and toss them in the trunk. Moisture + warmth + darkness = bacteria party. Hang bags to dry completely before folding. Keep a separate bin in your car or entryway for “dirty” bags so they do not mingle with the clean ones.

I now wash my bags way more often than I used to. The sour smell is gone. More importantly, I am not playing produce roulette every time I unpack groceries.