Printing in order-ID sequence means walking the rack once per parcel. Sorting by SKU means walking it once per product — same orders, a fraction of the movement.
Sorting is part of the free crop. Pick the keys in the order you want them applied.
Tick SKU and the cropped file is rebuilt so identical articles sit together. Add Size and Colour and each SKU breaks down further — all the M reds, then the M blues — which is the level most apparel and footwear sellers actually pack at. Size and colour come off Meesho label fields; on Flipkart you sort by SKU, Sold by and payment method. The order you tick them in is the sort priority, so SKU then size gives a different stack from size then SKU, and the workspace shows you the chain it is about to apply.
If a hero product must be packed and handed over ahead of everything else, upload your own SKU list — download the template, fill it in, upload the .xlsx — and Priority Sort puts those SKUs at the front of the batch. That one is a premium option at 1 coin per label; plain SKU, size and colour sorting stays free.