bag
幃 centers on a bag, specifically a cloth bag or sack used for carrying or storing items.
幃 combines 巾 (cloth) with 韋, which likely contributes the sound. The character originally referred to a cloth bag or sack.
The left side 巾 is cloth, and the right side 韋 looks like a container with something inside. Picture a cloth bag tied at the top.
For イ, imagine an easy-to-carry cloth bag: easy -> イ, and the bag is light and simple.