I've always read to keep paper and canvas in their original packaging. Seeing that the roll paper box is container board or corrugated case material, and the cardboard tube that the paper is rolled over is also the usual yellow-brown stuff, one wonders how acidic those items are and how they would affect the paper in the long term, especially for slower moving paper stock.
For cut sheets, many Hahnemuhle cut sheet matte paper just sit in the cardboard box they come in, with no plastic bag unlike the baryta papers. Wondering if the cardboard material for that is also acid free?
Is the plastic bags for roll and sheet media also acid free from all the good name manufacturers - Epson, Hahnumuhle, Canson, Harman, etc?