Articles grouped together in one packet

Printed matter (except literature for the blind), commercial papers and sample packets may be enclosed in one and the same postal packet subject to the following conditions– (a) each article taken by itself is within the limits applicable to it as regards weight and size; (b) that the overall size of the packet does not exceed the size applicable to letters; (c) that the total weight does not exceed 6½ lbs. to any destination if it contains an article transmissible as a printed paper; 5 lbs. to a place in the British Commonwealth or 4 lbs. to other countries if it contains an article transmissible as a commercial paper but does not contain an article transmissible as a printed (d) that the minimum rate of postage on each packet shall be twelve cents if each packet 30 transmissible as a commercial paper or a sample packet and five cents if otherwise.