Sustainable Flat Bottom Heat Seal Coffee Bag

What this pack is

This is a flat-bottom bag that stands upright on the shelf without support. The base is folded and heat-sealed to create a rigid structure, so the bag holds its shape during filling and stays square on the shelf. It is available in mono-material PE or PP, which means the entire pack - including any closure - can be processed in a single recycling stream. The material is a single polymer family, so it does not need to be separated from a mixed laminate. For coffee, this structure protects against moisture and oxygen when the correct film thickness and any additional barrier layer are specified. The bag is heat-sealed on standard filling lines, and the flat bottom allows for efficient use of pallet space.

The mono-material construction is a deliberate trade-off. PE and PP offer good moisture resistance and are recyclable, but they do not match the oxygen barrier of aluminium foil or metallised films. For roasted coffee, which releases CO2 and is sensitive to oxygen, you may need a one-way degassing valve and a higher barrier grade of PE or PP, or a short shelf life if the product is not protected. For tea, snacks, and pet food, the barrier requirement is often lower, and mono-material is a straightforward fit. The bag can be printed with a recycling logo to help consumers identify the correct disposal route.

Features and closure options

The bag can be fitted with a zipper for resealability, a tear notch for easy opening, and a one-way degassing valve for coffee that releases carbon dioxide without letting oxygen in. A window can be added to show the product, and a hang hole allows retail display. For larger formats, a carry handle is available. The flat bottom provides a stable base, so the bag can be filled on automatic lines and then packed into cartons or display trays.

Printing options include rotogravure up to 10 colours, digital, and flexographic. Digital printing is suitable for short runs and quick turnaround, while rotogravure is more economical for larger volumes. The bag can be produced in custom sizes and shapes, including stand-up, flat-bottom, three-side-seal, and organ bags. All materials comply with food safety standards for direct contact, and the manufacturing partner holds BRC certification, which covers hygiene and quality management at the factory.

Where it is used

This pack is used for coffee, tea, pet food, and snacks. Typical sizes range from 100 g to 5 kg, depending on the product density and the filling line. For coffee, common formats are 250 g, 500 g, and 1 kg. For tea, 100 g and 250 g are common. Pet food and snacks often use larger sizes, such as 1 kg to 5 kg, with a carry handle for convenience. The flat bottom makes the bag suitable for retail shelves, where it stands without a support. It is also used for contract manufacturing and private label projects where a recyclable pack is required.

The bag can be supplied with a degassing valve for roasted coffee, a zipper for resealability, and a window for product visibility. The recycling logo can be printed on the bag to indicate the material stream. The mono-material PE or PP construction means the bag can be recycled where facilities accept flexible PE or PP. This is a growing requirement in markets with extended producer responsibility (EPR) fees, where recyclability can reduce long-term packaging costs.

Filling, sealing and handling

Flat-bottom bags run on standard form-fill-seal lines or can be pre-made and filled on a separate line. The heat-seal layer is designed to seal through contamination, such as coffee oils or powder dust, but the sealing window depends on the film thickness and the sealant grade. For mono-material PE, the sealing temperature is typically lower than for PP, and the seal strength develops quickly. For PP, higher temperatures are needed, and the seal may require a longer dwell time. The flat bottom adds stability during filling, but the bag must be supported until the top seal is made. After sealing, the bag can be compressed to remove excess air before the final seal, which helps the pack stay compact.

The trade-off with mono-material is barrier. PE and PP are not as effective against oxygen as foil or metallised films, so for oxygen-sensitive products, a shorter shelf life or an additional barrier layer may be needed. If you need a long shelf life for coffee, consider a high-barrier PE grade or a different structure. For many tea, snack, and pet food applications, the barrier is sufficient. The bag is available with a degassing valve, which is essential for freshly roasted coffee to avoid the bag inflating and to protect flavour. The valve is one-way, so it releases CO2 but does not let oxygen in. The recycling logo and material identification help consumers dispose of the pack correctly.