Retail imports have been on the rise as the industry braces for the busiest time of the year. The National Retail Federation’s (NRF) latest projections call for a 3.6 to 4 percent increase in holiday sales for 2017 over the same period in 2016. That makes for a total of $678.75 billion to $682 billion, up from $655.8 billion last year. Most estimates see e-commerce shopping increasing by as much as 20 percent this year. With so much shopping to be done, retailers and shippers are bracing for the rush. Here are how some of the largest companies are preparing.