Millepede Cable Ties
Millepede Cable Ties are at first glance just regular zip ties—until you discover they can be unlocked and reused. And because the fastener works through any of the holes in the tie, you can cut off any excess after tightening it down and reuse it.
I can't believe I've never heard of these. Even if they don't hold as securely as zip ties, they'd still work for 90% of the things I do.
Millepede Cable Ties [Cool Tools]

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Neat! If these are the same thing, I've seen them in person before, even used a couple I found, but had no idea what they were called or where to get them. They also are softer than a nylon zip tie, and so don't damage the cable/object as much even if it's supporting weight. (Again, that assumes they're the same as what I've used.)
Regular zip ties can be unlocked and re-used as well. You just need a paper clip, knife point, nail file, or similar and a basic understanding of how the tie works.
Mostly good for if you are short on ties or need to get into something without it being apparent - I have used this for some stage gags & escapes where the zip provides the appearance of something staying sealed