Whether preserving for home use or commercial, the packing stick is important as it allows easy arrangement of produce whilst expelling air bubbles whose existence leads to ‘rising’ of contents.
Use the small rounded end to press fruit into position. With the flat square end slide pieces of fruit into position, paying particular attention to the first slices of fruit into the bottle.
Check out the neat Fowlers Preserving Interactive demo here or take a read through the All about Preserving Blog from Fowlers