Solar-powered lunchbox keeps your food hot or even cool, depending on what's inside - Yanko Design
Insulated Lunch Box with Superior Heat Retention Keep Food Warm for Hours | eBay
Thermal Lunch Box Bento Lunch Box With Stainless Steel Thermal Insulation, 1 - 3 Layers Of Food Containers Leak Proof For Kids, Adult Keep Food Warm S | Fruugo UK
Fridge Pak Insulated Reflective Lunch Bag with Pocket and Top Carry Handle - Keep Foods Hot or Cold up to 6 Hours (Blue) : Amazon.co.uk: Home & Kitchen
Insulated Lunch Box with Superior Heat Retention Keep Food Warm for Hours | eBay