Don't trash your silica packets! Toss them in the gun cabinet or tool box to prevent rust, slip one in the back of frames to spare photos from humidity, saturate with essential oils for cheap potpourri!
SHAPEABLE ice packs...but they all boil down to about the same thing..... To make your own shapeable ice pack: Mix 1 part rubbing alcohol with 3 parts water in a ziploc bag and put in the freezer. (The alcohol will prevent the water from freezing completely.) When it's frozen, wrap with a towel or cloth of some sort and apply.