London-based Notbox Co. has brought its eco-friendly cardboard box alternative to the United States and Canada, hoping to gain some market share in the $424 billion global packaging industry, of which North America accounts for more than 25 percent. Recyclable Notboxes are said to use lower costs — the company claims that removing cardboard from the supply chain could save more than $10 million — produce less waste and bolster a user’s environmental cachet. The durable boxes,...