Are quantity based rates possible on Shopify?

[Sid14]

Is there a way to set quantity based shipping rates with Shopify? I've scanned the forums and also tried various things to no avail.

To clarify, this is what I am trying to achieve –

• If 1 - 3 items, then USPS  First Class Mail
  With shipping being $4.99 >  First Class Mail  
  
  
• If 4 - 7 items, then USPS Priority Mail (FLAT RATE ENVELOPE)
  With shipping being $7.99 >  Priority Mail ENVELOPE
  
  
• If 9 or more items, then USPS Priority Mail (FLAT RATE BOX)
  With shipping being $9.99 >  Priority Mail BOX