The description small and large bubble wrap does not refer to the size of the roll but in fact the actual bubble size.
Small bubble wrap
Is suited to smaller lighter products and particularly good at protecting against scrapes and scratches. Due to the size of the bubble, it is commonly used for items such as books, beauty products, toys, small to medium duty frames and pictures, canvases, cutlery and much more.
Large bubble wrap
The air-filled bubbles are larger in size and therefore provide maximum cushion and surface protection on items with a larger surface area. Commonly used to protect furniture, fragile ornaments, heavy duty frames, canvasses and much more.