"If it fits, it ships": Flat Rate Boxes

April 18, 2019
1 minute read

Flat rate boxes let you ship within Canada at one convenient price.

There are three different box options so read below to find out more about each one and discover the right box for your shipping needs! The only limitation is your box should not weigh over 5kg, otherwise if it fits, it ships!
The price of each box includes the following features:

  • Postage
  • Tracking
  • Delivery confirmation
  • Up to $100 of liability coverage for loss or damage2

Purchase a Flat rate box in-store at any one of 60 post office locations. Find a location near you. While only available for purchase at select stores, the boxes can be sent from any post office across Canada. The smallest Flat rate box can even be sent from any street letter box. See more details about the flat rate box and its delivery standards in the tables below.

No need to search for packaging, to measure or calculate shipping rates: if it fits, it ships. Simply pack the Flat rate box without changing its dimensions and ensure its contents are secure to prevent movement during transport (see the type of items you cannot send in the mail here). Use this handy tool and check the Expedited Parcel delivery standard to find out when your items will arrive.

Delivery AreaDelivery Standard1
Local1 day4
Regional1 day up to 3 days4
National2 days up to 7 days4

Flat rate boxes come in the following three sizes:

SizesDimensions (l x w x h
in inches)
Dimensions (l x w x h
in centimetres)
PriceMax. Allowable Weight3Deposit Sites
Small10 3/8 x
14 x
2 1/8
35 x 26 x 5$17.995 kgStreet letter box,
Post office
Medium15 3/8 x
10 3/8 x
4 7/8
39 x 26 x 12$22.995 kgPost office
Large12 x
16 x
7 1/2
40 x 30 x 19$29.995 kgPost office

Price effective April 22, 2019

1 Canada Post offers replacement shipping service or credit equivalent to the cost of the flat rate box, if the sender’s shipment is not delivered on time, as measured against the published delivery standards, in accordance with the General Terms and Conditions Without a Standing Offer Agreement.
2 The Flat rate box includes up to $100 Liability Coverage. Exceptions and conditions apply. No additional coverage can be added. See Limitation of Liability and Guarantee at canadapost.ca/generalterms for more information.
3 All Flat rate box mailings must meet the requirements outlined in the General Terms and Conditions Without a Standing Offer Agreement. Flat rate boxes with alterations or exceeding the maximum 5 kg weight limit may be refused, returned to sender, subject to delay and/or additional charges may apply.
4 Delivery standards are for items sent between most major urban centres and depend on origin and destination. Delivery standards are in business days, not calendar days. Some exceptions apply.