I occasionally use a very long stretch of twine to transport light gear (<1lb) between my partner and I when we're camping out ~30m from each other.
Unreeling and reeling this twine is extremely cumbersome - it's often tangled and I have to buy a new batch.
What would be handy is a cheap, retractable reel that I can use to unload and reload (think vacuum cleaner cord). Does anything small, cheap, automated (press a button to retract), and portable exist for extremely thin twine (not electrical cord)?