[Pelham]

"Plummeting U.S. exports of recycled paper contributed to a 5.2 percent decline in overall U.S. exports during the first half of 2015, as lower-value commodities were hit by weak demand, a strong dollar and the lingering impact of West Coast port delays.

Recycled paper is the highest-volume U.S. containerized export"

http://www.joc.com/international-trade-news/trade-data/us-wastepaper-exports-plummet_20150820.html

[semimojo]

Recycled paper is the highest-volume U.S. containerized export

As your article noted recycled paper is very bulky and low value. It may fill lots of containers but doesn't really move the needle in terms of export value.

I've posted those numbers.