I have the Eagle Industries 32 inch discreet for my MP 15-22, bought at when is went on sale for Natchez on sale for $29.
It's has 2 securing straps inside for the rifle, a large external pocket, 4 internal magazine pockets, Velcro coupling carry handles and a shoulder strap.
It's made in the Dominican republic under license and I have since bought the 35 in LE version for my Daniel Defense M4.