Get a cheap Avenir rear rack then secure your backpack with some bungee net
Turning signals CarryBright Smart Bike TailLight... https://www.amazon.com/dp/B08GJL4CX5?ref=ppx_pop_mob_ap_share
Bike alarm
Wsdcam 113dB Bike Alarm Wireless... https://www.amazon.com/dp/B0734QN8KR?ref=ppx_pop_mob_ap_share
Nets
PowerTye 50152 Black 15"X15"... https://www.amazon.com/dp/B0022ZXO40?ref=ppx_pop_mob_ap_share
Mirrors. You’d have to buy two. Make sure to select left and right mirror.
MEACHOW 2021 New Bar End Bike... https://www.amazon.com/dp/B09C4HTRN4?ref=ppx_pop_mob_ap_share
Saddle bags
Kemimoto Motorcycle Saddlebags,... https://www.amazon.com/dp/B08T7CZPJZ?ref=ppx_pop_mob_ap_share
Lights for visibility
Ovetour USB Rechargeable Bike... https://www.amazon.com/dp/B08CR38F8F?ref=ppx_pop_mob_ap_share
Windshield
GUAIMI Windscreen 5"... https://www.amazon.com/dp/B07KP814YT?ref=ppx_pop_mob_ap_share
Checkerboard tape
Duck Brand 280410 Printed Duct... https://www.amazon.com/dp/B0058DV71A?ref=ppx_pop_mob_ap_share
Careful with this exact item. I ordered it a month ago and it was a absolute shit. It has 4 internal strands. By the time you stretch it tight enough to secure anything, the net had great big holes.
I bought this instead and highly recommend it. This is the net you deserve. Six internal strands.