By chance did you ask a similar question on Discord recently? If so, sorry for the duplicate advice lol. Making your own combined packs is super easy. Here's a tutorial for batch combining ztd files on Windows. It's a bit technical, but it's convenient and fast once you get the hang of it.
What You'll Need
Git for Windows: https://git-scm.com/install/windows
Install; you might need to restart your computer.
Step 1
Create a new folder, call it whatever you want. Anywhere is fine, we just need a workspace. Copy or move all of the ztd files you want to merge into this folder.
Step 2
Create another folder inside of your workspace. Call it whatever you want. I called mine 'combined'. Here is what your workspace should kind of look like:
Step 3
Right click on an empty area of your workspace to bring up the mouse menu. Look for 'Git Bash Here'. You might need to click on Show More Options first if you're on Windows 11.
Step 4
We're almost there. At this point a black console window titled MINGW64 should have come up. Click on it so you can type the following command. Note that if you named your 'combined' folder something different, simply replace the word 'combined' in the command:
unzip '*.ztd' -d combined
and hit <ENTER> on your keyboard. This will look for all files with the ZTD extension (aka ZT1 mods) within your workspace and combine them inside of the 'combined' folder. Below are screenshots of what should happen:
Step 5
Now go into your 'combined' folder. You'll see all of files unzipped in the same spot, which is what we want:
From here, use your favorite method to zip them up into a ztd file (super easy). If you're on Windows 10 or 11, you can select all of these files, right click, and Compress to... ZIP File. You'll have a new zip file in that directory, likely named after the first folder in your active directory (mine was animals.zip). You'll want to rename it to something different and change the extension to .ztd:
Step 6
Move your new pack into the dlupdate folder!
Troubleshooting
Keep a lookout for a question mid-merge that will ask what to do with duplicate files. You shouldn't encounter this with Hawkkeye's files, but you might with others especially if you download from ZooBerry. It's okay to type 'A' for [A]ll to this question. Usually it's just about a meta.toml file that contains author information not required for the mod to work.