Our psaltery carrying case/bag (which can be used for most any comparably-sized instrument) is made of heavyweight black nylon. It features a soft nylon interior (with super-heavy Cordura on one side of the inside, so your tuning pins won't poke through the padding), a generous exterior pocket, and a shoulder strap.
 
As an added bonus, our psaltery instrument carry bag even includes a Folkcraft Instruments logo, classily embroidered on the outside pocket.

This bowed psaltery case (gig bag) is 31" long and 12 1/2" wide, and will fit instruments up to 28" long, 8" wide, and 3" deep (including the pins and strings). If you have a psaltery that won't fit in this gig bag, we'll be happy to