If your lunch bag comes with care instructions and it says its OK to put in the laundry then its definitely okay to do so.
Can you put lunch bags in the washing machine. This is something I do on a weekly basis. Add cleaning product to the water or put it directly into the detergent dispenser. If you are unsure try washing it by hand first.
When was the last time you washed your lunch bag. Can I wash an insulated lunch box in the washing machine. I wash ours a lot but always inside a zippered gentle wash bag since I accidentally ruined my daughters favorite lunch box the picture cover frayed apart.
Check the lining of the handbag to determine if it can be machine wash and make sure it is not a shrinkage fabric. For soft-sided lunch bags pop them in a cool or warm wash on a gentle cycle and let it air dry when the machine is done. Lunch bags made from neoprene canvas and other fabrics can be washed in the washing machine.
Hand Washing Lunch Bags. Then on teh line or in teh airing cupboard to dry. But in answer to the OP yes I put the dcs lunchbags in the waching machine every halfterm adn school holiday.
Obviously an insulated lunch bag with a plastic core cant go in the washing machine but theres a good chance that you can wash its outer shell. I set mine out to air dry and by morning they are ready to go. Insulated lunch bags can be home to bacteria like Salmonella Listeria E.
My theory is this. For drying some are best to let air dry. Or if the lunch box can be easily replaced try tossing in the machine and see how it comes out.