According to the limitations set by Canada Post, the shipment across Canada and to the USA should not exceed 30 kg. International packets may weigh up to 2 kg, while packets sent to the USA should not exceed 1 kg in weight. The dimensions set for flat rate boxes differ for small (35 x 26 x 5 cm, 5 kg max.), medium (39 x 26 x 12, 5 kg max.), and large (40 x 30 x 19 cm, 5 kg max.) parcels. The minimum dimensions for mailing tubes are 100 x 23 x 23 mm, with a surcharge applied to cylindrical tubes.