Sourdough behaves differently in storage than a soft grocery-store loaf, and storing it the same way (a sealed plastic bag on the counter) is the fastest way to lose the crust you worked for.
Why Plastic Bags Work Against You
A sealed plastic bag traps the moisture evaporating from the crumb right against the crust, which softens a crust that’s supposed to stay crisp within a few hours. It also creates the exact humid environment mold prefers, so a plastic-bagged loaf can actually go bad faster than an unwrapped one, even though it feels like you’re protecting it.
Cloth Keeps the Balance
A breathable cotton or linen bag lets excess surface moisture escape gradually instead of trapping it, which keeps the crust firmer for longer while still slowing staling of the crumb inside. A Linen Bread Bag ($12.99) is sized for a full loaf and works for both crusty artisan loaves and softer sandwich-style bread.
Cut Side Down, Or Cut Side Covered
Once a loaf is cut, the exposed crumb is what dries out first. Resting the loaf cut-side-down on a board, or tucking the open end into the bread bag facing inward, slows that specific drying without needing to wrap the whole loaf in plastic.
Your Starter Needs Covering Too
This isn’t just about baked loaves — a resting sourdough starter or levain needs a breathable cover as well, loose enough to let gas escape but snug enough to keep it from drying out or picking up dust. Sourdough Bowl/Jar Cloth Covers ($12.99) are sized for standard jars and mixing bowls, which is the more practical fit than a stretched-over paper towel.
Longer Term: Freeze It
For anything you won’t finish in 2–3 days, slice and freeze it instead of leaving it out to slowly go stale. A cloth bag is the right call for what you’ll eat this week; the freezer is the right call for everything past that.
See the full sourdough tool kit guide for how storage fits with the rest of your setup.
Practical checklist
- Let the loaf cool completely before enclosing it.
- For near-term storage, choose airflow when crust matters and tighter wrapping when softness matters more.
- Freeze portions or slices if the loaf will not be eaten soon.
- Keep storage bags clean and completely dry between uses.
Frequently asked questions
Why did the crust turn soft?
Moisture moving from the crumb into a closed environment softens the crust. Brief reheating can restore some crispness.
Should sourdough go in the refrigerator?
Refrigeration can accelerate staling. Freezing is generally the more practical option for longer storage.
Can a bread bag prevent mold?
No container can guarantee that. Cool the loaf fully, avoid trapped condensation and discard bread that shows spoilage.
Continue your baking plan
Reviewed by Proof & Crumb, August 2026. Use product-specific care and safety instructions where they differ.