My niece has an ice brick in hers and takes:
Mountain bread wraps ( turkey/cheese/salad or falafel/humous/tabouli or tuna/lettuce/mayo)
Summer Cool. We are the only brand in the world to use ultrafine Merino wool to produce the finest, softest & most luxurious garments whilst keeping mum and bub cool and dry. Wear them multiple times before machine washing-hard to believe, but true.