As a rule, when shipping a package to Russia there is a restriction on the amount of weight per box per receiver. Russia allows shipping no more than 30 kg or 66 pounds per box for one person per month. It does make sense to convert kg to pounds. Because over there, in Russia, boxes are scaled by kg, not pounds. If one kilogram has 2,2 pounds, then 30 kg would exactly count to 66 pounds.
Additionally, according to Russian customs, it is advisable that the three dimensions of the box would measure no more than 1 meter in length, 60 cm in width and 60 cm in height. Again, if on one centimeter has 2.54 inches, then here in the US the box measurements should be no more then 39 inches in length, 23 inches in width and 23 inches in height. This is very important because if the box is measured more then above shown dimensions, at first, there is a high possibility that Russian customs will not allow the box to enter into the country and the box will be sent back to the sender. At second, the box could be considered as a freight or commercial cargo and additional customs duties would be imposed on receiver. You can ship the size of the box less than above-shown dimensions, but no more than 1 meter to 60 cm and 60 cm on all sides.