FAQs

Flat Stacks are collapsible, stackable, airtight, microwaveable, colour-coded silicone food storage containers that will declutter your kitchen and turn it into an organised, stress-free heaven leaving you feeling calm and freeing up more of your time and money to spend on the things you love.

Flat Stacks is a family owned and operated business consisting of a mother and son team. Flat Stacks were created by Julie, mother of 3 turned entrepreneur and her son Liam works with her. Julie takes care of product development, improvements and quality control while Liam is responsible for the day-to-day management of the business.

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.

Flat Stacks are microwave, dishwasher and freezer safe however we recommend washing the lids by hand as they will last longer and won't lose their shape. Flat Stacks cannot be used in the oven because they have a plastic component underneath the lip to keep the container rigid and this would melt in the oven.

BPA is an industrial chemical, often used in plastic consumer goods like water bottles and containers. Some studies have linked it to various illnesses. BPA Free means BPA hasn’t been used in the production of the container, and so is totally safe for your family to use.

Yes you can put soft foods and liquids like soups in your Flat Stacks however you do need to be careful not to put too much weight on the container as it could cause it to collapse and squash the food or liquid inside. Be especially careful if you're transporting liquids or squash-able foods in a backpack or bag not to put too much weight or pressure on the container as it could force the valve seal on top to push up and then it could leak.

There are currently 2 sets of Flat Stacks available, the signature set of 4 and the large set of 2 or you can get both and save with our value pack:

Signature set:

Yellow - 350 ml | 11.8 x 8.3 x 6.4cm | collapses to 2.6cm | 107g

Purple - 540ml | 15.1 x 9.3 x 6.4cm | collapses to 2.6cm | 142g

Orange - 800 ml | 17.2 x 10.7 x 6.8cm | collapses to 3.0cm | 183g

Blue - 1200 ml | 20.2 x 10.7 x 7.4cm | collapses to 3.4cm | 249.5g

Large Set:

Pink - 1500ml | 23 x 16.3 x 7.4cm | collapses to 3.4cm | 296g

Green - 2000ml | 25.8 x 18.3 x 7.4cm | collapses to 3.4cm | 350g

Currently we only have them available as sets containing multiple Flat Stacks however we will soon be making the individual containers available also.

Our store is powered by Shopify, one of the largest ecommerce platforms in the world with over 600,000 stores. Shopify handle all our payments and data security meaning your data is as safe as it can possibly be (we don't even have access to your credit card information).

Through our Shopify checkout you can pay by Paypal, Visa, Mastercard and American Express and you can checkout extra fast if you have Apple, Google or Shopify Pay as these options store your payment information and import it automatically save you having to type out all your details.

We offer free delivery with tracking within the UK for orders over £25 and orders under £25 are only £2.97. You also have the option of express delivery for an extra charge which will be presented in the checkout. All our orders are sent out within 1 business day of receiving your order and standard deliveries normally take 2-4 days and express deliveries 1-2 days. All parcels are sent with tracking and you will receive updates via email and you can choose to also receive them via Facebook Messenger or SMS.

We don't currently ship outside the UK but we are working on this at the moment and hope to be able to ship to the rest of Europe by December 2018.

Click here for more on delivery.

At Flat Stacks we really stand behind our product, we're a family business and we love the Flat Stacks and use them every day and we believe that you will love them as much as we do. However, if you're unhappy with your Flat Stacks for any reason you can return them within 30 days for a full refund.

Flat Stacks are also backed by our 12-month warranty against defects. Read more about our warranty here.