Spigen Core Armor case for the Galaxy S21 5G is a nice lightweight case that won't add weight to your Galaxy S21 5G or add much bulk to it as well! Though it won't protect your phone like an armor case but it will do the job to protect it and looks very nice as well. If you like showing off the color of your phone, then this case won't be for you as it covers the back completely.
The Spigen Core Armor case has some good grip to it and it allows you to safely hold onto your Galaxy S21 5G without the slippery feeling when holding onto your phone without a case. The rubber case does look like it provides some kind of drop protection, but if you drop it on a very hard surface above 3-feet, it might do some damage to the Galaxy S21 5G.
https://www.verizon.com/products/spigen-core-armor-case-for-samsung-galaxy-s21-plus-5g/?sku=sku4230078
Link to Verizon: Spigen Core Armor for the Samsung Galaxy S21 5G