If our goal is to reduce total emissions, then the fact that mylar is made from crude oil is only relevant if its other qualities don't outweigh the effect of production. They do. Mylar uses only 0.7% of the world's crude oil consumption. In addition, the fact that mylar bags are reusable many times further mitigates production costs. Every bag reused means one less produced. Moreover, we don't need to reuse individual bags for the same contents every time; we can allocate them to preserve different items as circumstances change.
We can repurpose mylar bags completely. Even if, for example, there is a pinhole puncture in a mylar bag, we could still use it to store things that do not need complete climate control. Clothes, shoes, camping supplies, and holiday decorations are just a few household items we can use repurposed mylar to store. Indeed, one man’s trash is another man’s treasure – and some people are more than willing to use mylar scraps for art, decoration, and other creative purposes.
Although most municipal recycling facilities cannot recycle mylar bags, companies like TerraCycle have begun to, and they excel at repurposing plastics like mylar into durable outdoor furniture. Furthermore, new technologies are becoming more accessible, and the expertise required to recycle mylar will soon be widely available.