Step 1: Materials
1-Bicycle Inner tube (split lengthwise)
1-Spool of Thread (I used canvas thread)
1-Knife or Something of the Sort
1-Thing of Adheasive Velcro
1-Pair of Scissors
Step 3: Sew, Sew, and Sew Again
Step 4: Flip it Around
Step 5: Velcro, Velcro, Everywhere
Not really; just add a little on the flap and the other spot, shown in picture.
Step 6: The Belt Loop
Once you do this, you are done! Now go embrace your inner Bear Grylls and run through the woods like a maniac with your new knife sheath by your side!