I have run into this so often, I just put anything less than a yard in a lingerie bag. Part of it comes from fabrics being cut so far off grain at the store. I have learned to point out this before the fabric is cut so they can give ne the amount I order (yes, I am a b***ch)
If in doubt, I run a zigzag stitch through, as long and wide as I can, easy to rip out later, but saves every bit of fabric. I also wash fabric as soon as it comes in, so if I cut chunks, I will not face washing tiny bits.