Backpack fee: This is the amount from which Backpack pays the traveler carrying your item from the US to Bangladesh. There are no surprises or hidden charges; on the contrary, based on the payment method selected, there's a discount applied during checkout. Depending on the item price, it typically adds up to 19%-25% of the item price, which is then reduced at checkout based on the discount we provide.
Sales tax: This is the tax that backpack gives to the US government to ship the item from one state to another. This charge fluctuates, but we determined one single flat rate, which is 9% of the item price
Shipping charge: This is the charge needed to pay for the item's shipping from the seller to the traveler's address within the US.
W/D (weight and dimension) charge: A weight/dimension (W/D) charge added to an item's price means that the item's shipping weight or volume occupied in the traveler's luggage, is relatively high compared to its price. This price is optional and might not be added to all the items that you see. You can see the w/d calculation in this article - http://bit.ly/2jtmFHO . Thanks!