I just wanted to add a little info to this about buckets and what I do.
The numbers on the bottom of buckets dont mean grade, It's to tell you what type of material it's made from.
The numeric codes that you see on many plastic items are used to help sort post-consumer plastics for recycling purposes. Different types of plastics are sometimes referred to as “resins†and the numeric symbols are known as “Resin ID Codes.†Each number (1 through 6) signifies a specific type of plastic and usually appears inside a small triangle (often formed by three adjoining arrows) imprinted on the bottom of a plastic item. The number “7†is used to represent a group of other plastics or combinations of plastics. Resin ID codes are not intended to provide guidance on the safe or appropriate use of any plastic item and should not be used for this purpose.
<1> PETE, aka PET (polyethylene terephthalate) Used for most transparent bottles, such as water, soda, cooking oil, and medicine bottles. Generally safe to use (not reuse); generally recycled.
<2> HDPE (high density polythylene) Sturdy, rigid plastic found in reusable food storage containers, milk and detergent bottles. Generally safe; generally recycled.
<3> PVC (polyvinyl chloride) Used for plastic wrap, and detergent and cooking oil bottles. Additives in PVC can increase the risk of birth defects and hormone-related cancers. Its production can be hazardous to workers and the environment. Generally not safe; not recycled.
<4> LDPE (low density polyethylene) Flexible plastic used for bags or wraps, such as produce bags and baby-bottle liners. Most number 4 plastics are not designed for reuse. Generally safe; generally not recycled.
<5> PPE, aka PP (polypropylene) Pliable plastic found in squeeze bottles, reusable food containers, and yogurt and margarine tubs. Generally safe; generally recycled.
<6> PS (polystyrene) Used in rigid take-out containers and foam meat trays. Can leach styrene when heated, a possible endocrine disruptor and human carcinogen. Not safe when heated; generally not recycled.
<7> Other; most often refers to PC (polycarbonate) This plastic is most commonly used for baby bottles, five-gallon water jugs, and reusable sports water bottles. It can leach out the hormone-disruptor bisphenol A, especially when heated. Because this group can include various other plastics, it has limited recycling potential.
I use cat litter containers as they are a #5. I caulk the lid shut when I drop my mylar bags inside and label them.
You don't need an impulse sealer. An iron works well, I use a hair straightener (gift from my wife :D ) because it acts like an impulse sealer (heat from both sides). look around for mylar bag dealers and look at the different sizes. I use two sizes and it works great for the buckets that I use (cat litter).
One more thing I do with my buckets is I number them instead of writing on them. It's up to you how you do it but I find numbering them is a little easier because I just change my spread sheet to what ever the new contents are instead of re-writing or relabel them.
So in this picture bucket 01 contains 25 pounds of bread flour and 05 contains 30 pounds of rice