The rates are based on our estimated weight and dimensions of the package. We send those estimates for your shopping cart contents to the real-time online rate calculators from the USPS, UPS and DHL website application program interfaces. The online rates quoted to us by the carrier are the exact same rates we show you during checkout, including our negotiated rate discounts from UPS and DHL. Then you are in control to choose between the carriers, service levels and prices that best meet your needs for that specific order.

The carriers determine their shipping rate to a specific destination using dimensional weight based on price per pound or fraction thereof (i.e. any fraction is rounded up to the next whole number), which sometimes means seemingly small changes in the shopping cart contents can have a significant effect on the shipping rate. The minimum rate is based on a package weight of one pound, which can make charges for an extremely small order of a low weight inexpensive item seem excessive. In a very few cases, the rates might be wrong for extremely heavy orders (example: large quantity of tanks or rebreather absorbent) or orders that contain large quantities of very low weight items (example: small hardware items like D-rings.) Occasionally, there is an error in our database for the weight of a specific product. If you think the shipping price quoted is incorrect, contact us and we'll immediately investigate further.

Please keep in mind that for a low value order the minimum shipping fees can be disproportionate to the value of the order, so consider carefully before ordering low value goods with expedited shipping. This is especially true for international shipping with expedited customs clearance fees or remote destination surcharges. Once you reach a minimum order value that depends on the destination, Super Saver shipping for most orders is FREE.