To get the most out of the fluffy experience of hand-carded fibers, it is best to spin/use the batt soon rather than store it for future use.
Store away from heat, humidity and insects.
*Storage Suggestion* Loosely wrap the fiber in tissue paper or a pillowcase, then place it in a resealable, airtight plastic container with your favorite natural moth repellent. Remember to check the fiber about once a month to air it out.
Spun & knitted fibre: Hand wash with a wool soap then dry flat.