How Backpack calculates the exchange rate? Backpack Support September 03, 2017 08:31 Updated Follow Currently, we are charging BDT84/USD. We are charging this amount based on the “HSBC Bangladesh dollar sales rate”. You can see this PDF for reference http://bit.ly/2nMSRo8 . Here the USD cash sells rate has been taken into account. Related articles What is the 9% sales tax that I see in the item? Do I have to make payment in advance? How much you are charging for an item? I'm a traveler, how do I get in touch with Backpack? Why is there a W/D charge added to the total price of my item? Comments 0 comments Please sign in to leave a comment.