REPLACEMENT HEAT PACKS Sale! from $10.00 Size Little Small Large Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. There are 3 sizes of replacement heat packs available for Warm Buddy plush animals. Little (3.5″ X 5″) Small (5″ X 6″) Large (5.5″ X 7″) SKU: LITTLE Tweet