If you’ve got a summer cookout going on, feel free to throw it right in the beer cooler with everything else. You can also freeze the glycerin the night before an outing, and keep it in a cooler bag with ice packs until you’ve reached the opportune time to toke.
There’s a few things to note when chilling your pipe: first, it’s never a good idea to throw your bong into your freezer--even if you somehow have enough space to fit a bong in your freezer, no glass can withstand freezing temperature without cracking. Some bongs come with a built in ice pick that lets you throw in some ice cubes into the bong’s neck, like the coil perc bong from Nucleus; you can also add on an ice catcher accessory. Alternatively you can put ice water in the bong’s ice catcher.
Glycerin, however, is generally preferred to all of these methods for a few reasons: one, it’s the easiest to use of all other methods. Second, glycerin will stay icy cold much longer than ice cubes do--after one hit, the hot inhale will blast your ice cubes into oblivion causing them to melt and slip right back into the bong water. With glycerin, you can go for multiple rounds and it’ll still be cold.