Reddit mentions of VELCRO Brand ONE-WRAP Tape 1” x 5’ Roll, Black

Genuine Velcro 1804-OW-PB/B-5 One-Wrap Self Gripping Strap, 5' Length x 1" Width, Black https://www.amazon.com/dp/B00I0TTPL8/ref=cm_sw_r_cp_api_i_mta8CbRMKHF5W

I would say it's as close to the vive w/ DAS as the quest could be comfort-wise, an immense improvement overall. The face cushion of the vive is more plush but that's the only difference IMO.

Links are in the description, but here they are as well:

• HTC Vive Deluxe Audio Strap - http://amzn.com/B06Y2GDXMC
  
• VELCRO Industrial Strength Strips: http://amzn.com/B0010HADEA
  
• 1 Inch Velcro Straps (The ones I used, but you can find better): http://amzn.com/B074V2MFMC
  
• 1 Inch Velcro Straps (Better ones): https://www.amazon.com/dp/B00I0TTPL8
  
• 1.5 Inch D Ring: http://amzn.com/B076J5RVNW
  
  edit: added new velcro

One thing I've learned is that zip tying your shit is a pain in the ass to do, and a pain in the ass to remove.

This is what you wanna get

It looks as if you you bought a rectangle battery pack then velco straps should work very well to hold it into place. Maybe a bit of black high-density foam rubber backing it to provide some spring/compression action to prevent bouncing.

If there is enough room for it.