Results for "flex"

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Did you mean the K9 Sport Sack ROVER, AIR, AIR Plus

Although K9 Sport Sack FLEX was discontinued, we consider The ROVER a perfect replacement. We are currently taking preorders for the ROVER. We are guessing that you are here because:

  1. Want to haul your heavier dog (30-80 lbs)
  2. Liked the lap belt feature, adjustability and sizing options
  3. Liked the materials and/or colors

Although the FLEX is gone, the ROVER addresses all of your larger pet needs. The ROVER is the results of years of customer feedback, development and testing.


The ROVER features a lap belt, internal frame, external storage, hydration options and as much padding as possible. Perhaps the best feature is the insulated interior lined with Outlast Adaptive Comfort Technology™ which acts as a barrier that keeps your dog at a neutral temperature in both hot and cold weather. Similar technology can be found in astronaut space suits to regulate their body temperatures. 

Please check back periodically for the ROVER's official release. You can follow us on Instagram or Facebook to see the official announcement in real-time or you can ask to be put on our wait-list by contacting and you’ll get an email notification when the ROVER is in stock.

Get your (big) dog on!