I have just taken ownership of my Pixel 7a and find that this cover is essential as the phone on it's own is quite slippery to hold. The cover fits snuggly over the phone and marries up with the colour of the phone.
I bought this cover and the phone on the Amazon site as it came as a package along with the 30Watt charger for the phone.
If you treasurer your phone you will need a cover for the Pixel 7a.