I only use a lightweight aluminum ID tag on a thin collar for everyday in the house (just in case my little Ziva escapee gets out- used once!)The other tags are kept on the harnesses they wear when the go out officially
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My two have matching collars and harnesses from Coastal pets lil' pals line. They are light, thin and no sharp edges. We have such hot weather the girls don't like the built up harnesses.
We have had a set of silk collar/harness from Chatties mom here on YT and highly recommend them!