I use the spools that hold electrical wiring. I get them from my electrician, he goes through them like crazy. The ones that hold 12-2 or 14-3 in 1,000 ft. They are not returnable so they throw them away, so any contractor in your area would likely be happy to save whatever you asked them to save.
They measure 13" tall x 15" diameter ends.
1/2" plywood ends makes them sturdy, yet light.
Made a 12-arrow pattern, and drilled it through with a 3/8" bit.
Covered the top, and the inside of the bottom with a cheap fleece blanket, attached with spray adhesive. Cut the blanket at the drill holes on top.
That size will hold 5 dozen fletched arrows neatly and compactly.