Ah well that's no good, when you have to sort, and find each item, i noticed on the usps in USA, you can do this...
As printing 20-30 items one by one, is very time consuming,

USPS is American Post.

You can print multiples through Australia Post Click and Send. But you generally pay more than the eBay equivalent.

I don't do 20 or 30 per day, but I find printing one at a time helps me not to confuse what label goes with what package. I don't use postage labels to find my stock, however. That's done way before postage is done.

So i guess you could have your label printer near your stock, so you know which label goes where ?

oh yeah that sounds like a good idea 🙂

My label printer is next to my computer and not portable.

I dig my items when they are paid for, then pack them, print the label, attach to the relevant parcel and put in the to-be-posted pile. One at a time. Not hard and not particularly time wasting. I can have a day's parcels packed, then just need to print the labels, stick them in the satchel, stick the book in and seal. The only extra time is in the 3 metre walk from my desk to the packaging area.

if you don't want suggestions, maybe don't ask in the first place.

Nice i have many books but never bothered to list them LOL

Your problem. I sell a few.

But I seem to be more professional than you. LOL