Hello, first of all, thank you for your interest in our product. The base of our bag has a reinforced structure, its stitching and first-class linen outer fabric are quite resistant to the weights of daily use. However, we would like to clarify a small detail with transparency: The 45-liter specification in the product name refers to the bag's internal volume (width), not its weight-bearing capacity (in kilograms). Since our bag is not designed as a load-bearing bag, filling it with heavy items beyond its capacity may damage its shape in the long run. However, if it is not carried for a very long distance as you specify and if there is a balanced weight, it will definitely not let you down. When it comes to heat preservation; thermal bags work on the principle of maintaining the current temperature of the product placed inside them. If you add a few ice packs or frozen water bottles to the bag while carrying your unfrozen meat, it will safely keep your meat cold for an average of 6-8 hours, and your frozen meat for 12-14 hours, depending on the outside air temperature. We hope you enjoy it in good times.