I always have a multi-tool on my belt at work. Problem is, after a year or so the Velcro closing tab loses its "stickiness". My solution is to use the powerful magnets from an old hard drive to replace the Velcro on the flap. With the flap closed the magnet sticks securely through the holster to the metal multi-tool within.
Your old non-sticky multi-tool pouch
A dead or obsolete hard drive
Small piece (less than 3" square) of tough fabric like denim, canvas, or heavy cotton
Appropriate Phillips or Torx drivers for opening hard drive
Vice grips, pliers, and/or bench vice
Sewing machine or hand sewing equipment
Safety: Mind the scissors and needles, don't poke a screwdriver through your hand, careful using the razor knife. The magnets retrieved from hard drives can be very powerful. They can snap your fingers, destroy CRT monitors, erase precious data on your hard drives, memory cards, and credit cards. If you don't have the right tools or skill set to attempt this project, please don't.
Step 1: Hard drive opening
Here we dissect a hard drive to remove its powerful rare earth magnets. This is an old 1 Gb hard drive donated by my buddy in the IT department at work. I trip over old hard drives at work, you may need to be more creative. Try your IT department at work, go to the repair center at you local computer retailer, dumpster dive, just try and get one for FREE. No reason to spend even $5 on a hard drive your just going to destroy.