LotFancy cooler ice packs are slim and freeze fast (within 2.5 hours) large surface area cools items quicker and longer. Our lunch cold packs are filled with a safe non-toxic gel formula. Hard outer shell made with food-grade high-density polyethylene BPA free non-toxic leakproof and break-resistant thicker shell than other brands and will not deform after being frozen.Each freezer block has a hole in the middle for better handling and to keep the gel evenly spread through the cooler ice pack prevents gel from collecting and bulging in certain spots. Our lightweight slim freeze packs fit nicely into most lunch bags boxes coolers breast milk bags bento boxes and grocery totes. Great for use at school work picnic camping road trips and other outdoor activities perfect for your kids school lunch.