Nice! Great to see folks with various flours. Mine tend to AP, bread, whole wheat, 100% rye, buckwheat, semolina, rice flour, etc.
I purchase food safe 2 and 5 gal buckets from CAL RANCH. They have a rubber gasket hard seal lid that snaps on top, with a rubber gasket screw top center. It holds a 25 lb bag of flour easy. If you buy flour in 25lbs, which is common for AP amd bread flour, it is often 1/3 the price or less. There is also a rubber nipple to let gas in, like how you inflate a soccer ball or basketball. This lets you inject nitrogen to displace O2 and stop oxidation, staling, and rancidity.
Bucket and lid are just $10, nitrogen can be gotten at any welding supply.
Everything you ever wanted to know about long term bulk food storage can be found at providentliving.org , the Mormon supply site that supports their "6 months food supply in stock" thing.