Flat Stacks bases are made of silicone, not plastic. Silicone is a strong, flexible and durable material that can withstand extreme heat and cold without bending or cracking so it’s very long-lasting. Unlike plastic containers, Flat Stacks will last you many years so you won’t need to replace them saving you money and helping the environment. Silicone is also BPA free which means it’s non-toxic and safe for you and your family. The Flat Stacks lids are made of a BPA free plastic.

Silicone is a very durable and long lasting material. We give you a 5 year warranty so you can be guaranteed they will last at least that long. However we expect with average use they will last you upwards of 10 years making them a great investment as they will save you money over the long term on replacing plastic containers that become warped and discolored.

When you buy direct from us with this special offer we give you an extended 5 Year Warranty. This covers both the bases and the lids for any faults or failures from normal usage.

Yes both the bases and lids are BPA free.

Yes they are, when microwaving make sure the air vent is open to release the steam.

For this special offer we are including Free Shipping which normally costs $15. We typically send out all orders the same or next business day. From that point it depends on where you live and how busy US Post is. Most customers receive their orders in 3-7 days from when we send it however if you’re in a more remote part of US, it can take longer. Also, COVID has been affecting shipping times and so it may take a little longer than usual. We always use tracked shipping so you will be able to check where your parcel is at all times.