What is it made of and does it leach any chemicals?

Good question. It would be helpful to know if the bags are made of PET, which can leach antimony at high temps (above 65 deg C, ~ 150 F). In some climates they might reach such high temps . The black color is not helpful. It might help to keep the base of the pots in the shade & water frequently (should help the plants, too) - & don't store the bags in car or garage.

Could you provide me with the measurements of the bags HxW so I can make my choice and how many per pack.

Amazon tends to change things, but as of today (4/12/2020), the dimensions are h x d (based on measurements from manufacturer website). In case that changes, the diameter is the unique number and increases before the height: for example the 3, 5 and 7 gal are all 10" high and 9", 12" and 14" in diameter, respectively. Next set are 12" h, etc.

Exactly how many years should I expect these to last?

I guess if you clean them out, rinse them well, let them dry and store them away until next season you should expect to get at least 3 years or more. I would not leave them out in the weather all winter. I also found the 5 gallon size a bit small for tomatoes or peppers and have gone to at least 7 gallon size or even 8-10 gallon for those plants. Zucchini and eggplant do great in these fabric pots also, just be prepared to water at least once a day and even more in very hot weather. Enjoy your garden !

Model Number	FBA_311001
Package Dimensions	25.6 x 16.4 x 5.8 cm
Material	不織布
Color	ブラック
Size	3 Gallons
Special Features	排水穴
Package Weight	0.45 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	VIVOSUN
Capacity	12 Liters
Item Weight	422 g

VIVOSUN 3ガロン 植物が袋 育てる5パック プレミアムシリーズ ハンドル w/不織布曝気ファブリックポット thichkened 5パック3ガロン ブラック5Pack

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VIVOSUN 3ガロン植物が袋育てる5パックプレミアムシリーズハンドル w/不織布曝気ファブリックポット thichkened 5パック3ガロンブラック5Pack