Give a rough estimate of the weight of the package. The shipping service will give you a precise estimate when they weigh the package at their shipping center.
In the US, the Priority Mail envelope option is available for books under four lbs. (1. 8 kg). Size matters. The USPS, for example, will charge you extra if the envelope is uneven or rigid.
The smallest box from the US Postal Service has a weight limit of 4 lbs. (1. 8 kg). Larger boxes have a limit of 20 lbs. (9. 1 kg). Your post office may not accept boxes heavier than this. Consult the shipping company about their box sizes. They will charge extra for packages that don’t fit their standard box dimensions.
Not all post offices in the US have M-bags available. Call ahead to see where you can find one.
Most companies will provide shipping material. If you bring your own, make sure the box or envelope is sturdy.
Splitting up heavier packages may save you on shipping expenses. Calculate how much it would cost you to send two packages instead of one heavy one. For an M-bag, for instance, the bag shouldn’t weigh more than 66 lbs (30 kg), including the sack.
When shipping via M-bag, you’ll need to fill out another address label to place on the bag.
These forms can be found online and filled out at home. Post offices and shipping companies also stock them. The post office or your local government can answer any questions you have.
