The Black Diamond Blitz 20L pack is best suited as a lightweight climbing pack or more specifically as a summit pack.

The description from Black Diamond and the video below gives a good description of the pack.

"Designed with knowledge from years spent in the mountains, the Black Diamond Blitz is the answer for serious summit pushes, making it the ultimate on-route pack. With all the features of a summit pack, the new Blitz packs are constructed from our new BD UHWMPE “Mini Rip” 100d body fabric, giving them the ideal balance between being ultra-durable, hyper-light, and extremely packable. A one-handed top closure simplifies your system while keeping the elements out, and the strippable design adds even more weight savings, with a removable bivy pad. A color-coded red rope strap is easy to find, while the ice tool Pick Pockets™ have been updated with our new custom metal dogbone attachment for added ice tool security. Hydration compatibility rounds out the feature set for an on-route pack built for the send."

Video

Black Diamond Blitz Packs.

Features

• BD UHWMPE “Mini Rip” 100d Nylon with 200d PE body fabric
  
• One-handed top closure
  
• Easily accessible, water resistant zip pocket on lid
  
• Strippable design with removable hipbelt, and frame sheet / bivy pad
  
• Color coded red rope strap
  
• Ice tool Pick Pockets™ with our new custom metal dogbone ice tool attachment
  
• Hydration compatibility
  
• Internal zippered pocket
  
• Raincover available separately

Specification

• Material: BD UHWMPE “Mini Rip” 100d Nylon with 200d PE body fabric
• Volume: 20L
• Weight: 390g