Emailed customer service asking how to add extensions to the main straps for J107 Dragonfly backpack. He email back stating to give these strap extensions a try, but they may not fit your backpack and they didn't fit, too small. Was disappointed customer service didn't know for sure if it would fit or not.
Love the pack just needed more strap for carrying bow.

Wife’s grandfather handed me down his old xo-1 pack and straps were worn down, these straps made a huge difference went from paper thin to thick comfortable padding! Used it on a 7 mile Arizona and didnt feel fatigued at all!

38mm x 12" Strap Extensions

Nice straps but they're way too small to do anything with. By the time you make a loop, run it through the buckle, you've only got a few inches of usable strap. I should have thought that through more.

Just what I was looking for to secure gear to the bottom of my FAC Track pack I purchased for work.

Great to use, you can also combine several to extend the length needed.

I purchased the three pack to extend a plate carrier and a duty vest. Worked perfect with a little cutting and adjusting. Good quality.Everything stays where it’s supposed to when adjusted. I’m a big boy and finding products to fit is impossible. Again, good quality products.

These are a fantastic addition to the pack. I can now cinch down an elk quarter
and then some without breaking my fingers snapping the buckles.Now if you could just get the front straps back in stock, my pack will be complete.

Extensions work good. But if you came out with more of backcoacking style backpack for the F1 mainframe that would be awesome. If you made it so the bag had a separate compartment for a sleeping bag and a compartment for everything else the system would be perfect

These straps didn’t fit anything on my m1 pack