TL;DR: Be careful when manually deleting packages in /var/log/CPda!  You might not want to do this without careful consideration.
 
If these are jumbo hotfixes you've downloaded, but not yet installed, you can delete them in CLISH with "installer delete <tab>" for an auto-complete list of options.
However, if these are jumbo hotfixes you've installed in sequence, be aware that if you delete the packages manually in /var/log/CPda, you will no longer be able to uninstall the current hotfix bundle and restore to previous versions!  A dependency chain is created each time you install a new jumbo hotfix after another.
If you have installed several of these over time, they can consume a lot of disk space.  The only remedy is to get a full backup of your configuration and either re-install with the current version and start a new dependency chain with the latest hotfix.  If you do a major version upgrade, such as from R81.20 to R82, this also starts a new dependency chain from R82.  In this case, you can safely delete all of the older packages in /var/log/CPda.
When doing a full version upgrade, such as with the Blink images, the new OS is installed to a new LVM logical volume and the prior one is saved for a restore.  If you don't need this older version anymore, you can delete that logical volume and reclaim that space into the volume group.  You can delete this older volume with the CLISH command "delete snapshot <tab>" to see the options.