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ThenewEngelBackpackCoolerfeaturesarugged,tear-resistant500-denierpolyesterdiamondripstopoutershel
withawaterproofTPEcoatingforeasycleaning. Ontheinside, there’stworadiantbarierlinersofreflectivefoil –an-
otherexclusiveEngelfeatureyouwon’tfindonotherbags.Sandwichedin-betweenthefoillayersisa1-inchthick
layerofclosed-celfoaminsulation.Whiletheinsulationefectivelyminimizesheattransfertomaintaincoldinner
temperatures, theradiantbarierlinersreflectsthesun’slong-waveheatradiationtofurtherenhancetheBackpack
Cooler’scold-keepingcapabilities.Undertypical conditions, theBackpackCoolerwilholdiceforuptothreedays.