Some tips to store cement bags:

Never store cement bags in wet area. Store in a dry concrete floor.

Never stack up cement bags against wall surface. (the cement bags should not touch wall surface) Maintain gap between wall and cement bags.

Store cement bags in a weather proof godown/house.

Always cover cement bags with tarpaulins fully.

Avoid cement bags exposed to rain, cold etc.,

Keep the cement bags closely tightly together to avoid air circulation between them.