Outside of the of the Americas, most of the world uses "A4" paper, which is a little longer and a little narrower than standard "Letter" size paper used in the US. A4 paper is 8.27" x 11.69". US "Letter" size paper 8.5" x 11". Most home and office printers can use A4 paper either with a paper tray (adjusting the setting to "A4" from "Letter") or using the manual paper feed. A4 and Letter size paper are different than Legal size paper, which is 8.5" x 14". We carry Double A brand (high quality) 80 grams/m
A double wall box has two layers of corrugated cardboard, making it much stronger than cheaper "single wall" boxes most commonly sold in office supply and shipping stores. Sometimes double wall boxes are known known "heavy duty" or "export" boxes. We sell very strong ECT 48 275 lbs. (200 lbs. tested) double wall boxes.
Very few retailers sell either A4 paper or double wall boxes, as its costly to keep in stock and is far less popular than letter size paper or single wall boxes. Because of this, you normally have to buy it from a wholesaler, who normally only ship by the case or bundle, with large minimum orders and/or shipping charges, as wholesalers often ship via freight trucks by the pallet load, unlike retail office supply stores that use FedEx, UPS, or local delivery services.