Why are my aliases larger than 4k ?

I just set up a whole lot of image files in a special alias folder. I expected each alias to be 4k in size. About 10% are 4k, the rest are between 44k and 56k.
The originals are all Photoshop JPEGs, created in Photoshop 2 and Photoshop 7.
I thought an alias was just a file pointer. Why are some of them so large? Is there any way to make them smaller? They are taking up way too much space on my USB thumb drive.
iMac G5 17" 1.5Gb RAM   Mac OS X (10.4.5)  

Ok Niel - so far, so good. I have done what you suggested, and yes I now have a folder of 4k aliases - so thank you for that idea.
The one small problem is that there is no icon of the image that the alias represents, at least not until I click on the alias name in column view, when it shows up nicely. But in list view, icon view, or unselected in column view, I can't see what it is. Is there any way around this? I have tried using Get Info to paste the image into the icon field, but it won't let me do it, and I suspect that would increase the size to more than 4k. What I want is the old OS 9 system that would create a 4k alias AND give me a tiny image of the file as well.
If I really can't do it, then I will have to live with using the filename alone, but at least I have 4k aliases.
iMac G5 17" 1.5Gb RAM Mac OS X (10.4.7)

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