Thermos Conducts Survey on Insulated Bags, Announces Tips for Improving Cooling Performance

Many eco-bag users regret not having an insulated bag during summer shopping.

64% of consumers notice changes in the state of refrigerated or frozen foods after summer shopping trips, with many noting this has become more frequent in recent years.

71% of insulated bag owners have experienced drinks or food becoming warm or melting, even while using the bags, though 80% take some kind of cooling measure.

Thermos K.K. (Headquarters: Minato-ku, Tokyo; President: Yuji Kataoka), a global leader in vacuum-insulated products, surveyed 1,081 individuals who shop for groceries daily regarding their use of insulated bags. The results revealed that many people experience food becoming warm or melting even when using insulated or cooler bags. Given the recent extreme heat, Thermos, which has been producing insulated bags since 1993, is sharing tips to enhance cooling performance.

<Survey Overview> Period: December 26, 2025 Participants: 1,081 individuals aged 20+ nationwide who shop for groceries regularly Method: Internet survey

Consumers regret lack of insulation during summer shopping While 67% of people use eco-bags for daily shopping, 69% of these users have regretted not having a bag with cooling functionality during the summer.

High percentage of consumers notice state changes in food 64% of consumers have experienced refrigerated or frozen food arriving home warmer or partially melted. Among these, 44% feel this has happened more frequently recently.

71% of insulated bag owners have faced cooling failure When asked about their experiences during summer outings, 71% of insulated bag owners reported instances where food or drinks warmed up or melted despite being in a bag.

Tips from Thermos to improve cooling performance 1. Pack tightly to eliminate gaps: Empty space causes cold air to escape. Use chilled water bottles, towels, or newspaper to fill gaps and stabilize temperature. 2. 'Bag-in-a-Bag' method: The ultimate cooling technique. Creating a double layer of insulation provides the highest effectiveness against outside heat.

Proprietary 'Isotec' Technology Most Thermos soft coolers feature 'Isotec,' a proprietary multi-layer insulation structure that provides both high cooling power and structural stability.

New Products Launching February 21, 2026 New backpack and shoulder-type insulated bags will debut, catering to both daily and outdoor needs.