Having to cut the ties off of your cable bundles when you need to alter them is a pain, not to mention it just feels wasteful. Enter releasable ties: they can be easily removed and re-used, again and again! Mille-ties are a great example, and are available in standard, heavy duty and plenum-rated models. There are also releasable marker ties, two piece ties, and for larger bundles, check out Panduit's "Elastomeric" stretchable ties.