BOPP Bags — Side Gusset & Flat

Rusks are one of the harder things to pack properly, because everything about them fights the pack at once. They are bulky, they are fragile and they are bone dry.

The side gusset handles the volume. The two folded side panels open out as the bag fills, so the bag takes a deep load and still sits square and rectangular on shelf instead of ballooning into a pillow. A squared-off pack faces properly, blocks cleanly next to its neighbours and does not waste shelf depth.

BOPP's stiffness does the protecting. The film holds its shape rather than collapsing onto the product, so the rusks are not crushed in handling and transit, and the bag reaches the customer with whole product in it rather than a bag of crumbs.

Clarity does the selling. Buyers of rusks look at the product before they read the label — the crumb, the seed, the bran and the colour of the bake all tell them what they are getting. BOPP is very clear and glossy, so the product shows honestly through the film.

The critical requirement, though, is moisture. A rusk that picks up humidity goes soft, and a soft rusk loses the customer for good. The pack has to keep water vapour out for the whole shelf life, through a South African summer, in a shop that may not be climate controlled. Where clear BOPP alone does not give you the margin you need, we move to a barrier structure. A Euroslot header for hook merchandising and a tear nick for clean opening are both standard options.

Dried fruit and nuts look like one category and fail in completely different ways, which is why they get different specifications.

Dried fruit sits in a narrow moisture window. Too much moisture transmission through the pack and the fruit hardens, darkens and loses the plump appearance that sells it. The pack has to hold the product roughly where it was when it left the factory, and the film is what does that.

Nuts fail through oxygen. Oxygen attacks the oils, the oils go rancid, and rancidity is the most common reason nut product comes back. Higher-oil nuts and anything roasted are the most exposed. For those, a metallised or barrier structure buys real shelf life rather than a marginal improvement — it is usually the difference between a product that holds through its life and one that does not.

Tell us the product, its oil content and the shelf life you are targeting, and we will specify the structure around it. Contact us with your requirement.

The same bag suits most of the dry-goods aisle. Cookies and biscuits need the stiffness and the clarity for the same reasons rusks do. Chips, crisps and popcorn need volume without a bag that balloons, and a pack that presents full on shelf.

Beyond that we run snack mixes, sugar confectionery, cereals and granola, pasta, flour and dry staples in the format. Anything dry, anything bulky, anything that has to look good and sit square is a candidate.

BOPP is biaxially oriented polypropylene — a monomaterial film. That matters more every year. A conventional laminate bonds several different plastics together, and a mixed-material pack is effectively unrecyclable in practice, so it ends up in landfill. A monomaterial BOPP bag is 100% recyclable through the polypropylene stream, so the pack has somewhere to go at the end of its life. DH Flexibles is a member of Polyco.

The film also happens to be excellent packaging on its own terms. It is stiff, it is glossy, it is very clear, it takes print well and it seals reliably on a production line. Where BOPP alone does not give the barrier a product needs, barrier films are available — and that is a conversation worth having up front rather than after a shelf-life trial.