I use the DjI soft case most of the time for my Mavic Air.  It works great and is light and small.  Sometimes I need better protection and I bought a Smatree pelican style hardcase.  It is customized for holding the Mavic Air.  Works great and is waterproof so trips to the beach are less stressful to me.

It has shoulder strap attachment points but I can't find a strap for sale.  Does anyone know where I can get one?

The case is here - CASE

Hello and good day Dakar Enduro. Thank you for reaching out and for the information you have shared with us. This is a beautiful carrying case for your DJI Mavic Air. Have a safe and happy flying always.

Thanks for sharing

I used these to make the attachments for a strap - https://www.ebay.com/itm/Bulldog ... -Loop/202451949158?
Basically cut them down, remove the velcro and stiched them up, slid them into the slot and inserted a pin to stop them coming out.

This listing includes an item for the strap - https://www.ebay.co.uk/itm/273406640096?