Consider making a habit of making your own lunch, rather than relying on takeout food supplied with single use packaging and utensils. A good quality lunch cooler like this one from Kooshty will make it a lot easier. The bonus is that it’s made using RPET fabric, which is a material made from recycled single-use plastic bottles. 

21 ( l ) x 15 ( w ) x 27 ( h ) cm
600D RPET fabric
8.5L

Features include:

made from recycled plastic bottles
front zipped pocket for extra storage
RPET fabric zip pullers
superior quality aluminium foil lining with 2mm foam padding for insulation
adjustable striped webbing handle
padded carry handle
side mesh bottle pocket 
piping detail around the edges for firm structure