It is bad design to interconnect your access layer switches. Always double uplink your access switches to a distribution switch/stack. And of course if you can make sure your uplinks use a different path for decent redundancy. Also having copper links in uplink port-channels is a risk since you can have negotiation issues where one link gets negotiated lower than 1 Gbps causing your port-channel to drop. So fiber is recommended between distribution and access layer even if you are only using 1 Gbps links.
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