Hi Claire- Your mylar bags will stack much easier in heavy duty plastic totes than in buckets. The rectangular shape fits nicely. In addition, you can stack more totes on top of each other for space saving than you can buckets. The mylar itself prevents any possible contamination from the plastic tote and the tote keeps pests from chewing your bags! I also started with mylar bags in buckets but quickly reorganized once I realized I could only get about 5-7 bags in a bucket no matter how I squished them. I now use my buckets and gamma lids to store my daily use flour, sugar, oats, rice, etc. since they are easy open. You can also purchase mylar bags in a large 5-gallon size that are designed to fit inside a bucket. You put the bag in the bucket, fill it with rice or whatever, then seal it and put your lid on. In this instance, you do not loose any storage space and still have the benefit of the mylar.