Plastic-free packaging gets talked about as though it's a simple switch: swap your plastic for paper and you're done. For most small businesses sending real parcels through the UK postal system, the reality is more nuanced. Some packaging genuinely has a plastic-free alternative that performs just as well. Some doesn't, at least not without a meaningful tradeoff in protection, cost, or practicality. Being honest about which is which makes for a better decision than chasing a fully plastic-free claim that doesn't hold up under scrutiny.
This guide looks at what's genuinely achievable across mailing bags, tape and grip seal bags, where plastic-free alternatives work well, and where the more realistic goal is reduction and proper recyclability rather than elimination.
Why "plastic-free" is harder than it sounds for shipping
Packaging that goes through the postal system has to do a genuine job: protect contents from water, withstand mechanical handling, and seal reliably without failing in transit. Plastic, specifically polythene film, is good at this for reasons that are hard to fully replicate with paper or other materials. It's naturally water-resistant, flexible enough to conform to irregular shapes, and lightweight relative to its strength. Any alternative material needs to match these properties to actually be a viable substitute, not just a different material that happens to avoid the word "plastic" on the label.
This is why a fully plastic-free packaging operation, for a business sending parcels through standard UK courier and postal services, is genuinely difficult to achieve without compromise. The more honest and achievable goal for most small businesses is minimising plastic where it isn't doing essential work, and ensuring what plastic remains is recyclable and used efficiently.
Mailing bags: where plastic-free isn't really achievable without a tradeoff
Standard mailing bags are made from LDPE polythene film, and this is genuinely the right material for the job in most cases. The water resistance and flexibility that make a mailing bag work well for shipping clothing are not properties that paper alternatives replicate without significant compromise.
A paper-based mailing alternative offers none of the water resistance a polythene bag provides as standard, which matters considerably in UK weather conditions. It also doesn't conform to irregular shapes the way flexible film does, meaning a paper alternative often needs to be a more rigid envelope shape, which limits what it's practical for.
What is genuinely achievable here is using mailing bags made from recycled LDPE rather than virgin plastic, which reduces the environmental impact of production even though the material itself is still polythene. Our mailing bags are made from 100% recycled LDPE, which is a meaningful step even though it isn't a plastic-free claim. The honest framing is "recycled plastic, recyclable at end of life" rather than "plastic-free," and that's a credible and worthwhile position rather than a compromise to be embarrassed about.
Grip seal bags: similarly limited plastic-free options
The same logic applies to grip seal bags. The press-to-close seal that makes them genuinely useful and reusable relies on a flexible plastic film with enough structural memory to interlock reliably and repeatedly. There isn't a practical paper-based equivalent that replicates this resealable function, which is the entire reason these bags are used in the first place rather than a simple paper envelope or pouch.
For most uses, grip seal bags are a small amount of material doing a genuinely useful job: containing and protecting small items that would otherwise be loose, lost, or damaged. The plastic-free conversation for this product category is less about finding an alternative material and more about using the right size for the job, so no more material is used than necessary, and ensuring the bags are reused where practical before disposal.
Packaging tape: where a genuine plastic-free alternative exists
This is the one area across these three product categories where a properly plastic-free alternative is both available and performs comparably to the standard option. Kraft paper tape, made from paper with a hot-melt or water-activated adhesive, seals cardboard boxes reliably and is fully recyclable alongside the box itself, with no separation needed and no plastic involved at all.
The tradeoffs are modest. Kraft paper tape rolls tend to be shorter than standard polypropylene rolls, so you'll get through more rolls for the same number of boxes sealed. Self-adhesive kraft tape doesn't have quite the same tamper-evident security as standard plastic tape or water-activated kraft tape, though water-activated kraft tape actually offers superior tamper evidence, since it bonds to the fibres of the box itself and is genuinely difficult to remove without visible damage.
For a business that wants a genuinely plastic-free claim on at least part of their packaging, switching tape is the most straightforward and complete way to achieve it within these three categories. Our kraft paper tape is a direct swap for standard tape with no change needed to how boxes are sealed.
What "achievable" actually looks like for most small sellers
Given the above, a realistic plastic-free or reduced-plastic packaging strategy for a business using mailing bags, grip seal bags and tape looks something like this: switching tape to kraft paper where boxes are used, which removes plastic entirely from that part of the packaging. Using recycled-content mailing bags and grip seal bags rather than virgin plastic versions, which doesn't eliminate plastic but meaningfully reduces the environmental impact of production. Sizing bags and tape correctly so no more material is used than the job requires, which reduces total plastic volume regardless of material type. And ensuring customers and the business itself know how to recycle the polythene products properly at end of life, since recyclability that isn't acted on doesn't achieve anything.
Being honest with customers about what you're actually doing
If sustainability messaging matters to your brand, precision matters more than enthusiasm. Claiming "plastic-free packaging" when your mailing bags are polythene, even recycled polythene, is a claim that won't hold up if a customer looks closely, and overstated environmental claims are increasingly scrutinised both by customers and by advertising standards bodies in the UK. A more defensible and equally positive message is something like "recycled and recyclable packaging, with plastic-free sealing tape," which is accurate and still communicates genuine effort.
Customers who care about this generally respond well to honesty about where the limitations are. Explaining that your mailing bags are recycled LDPE because the alternative doesn't protect items as reliably, and that this is genuinely recyclable through supermarket soft plastics collection points, is a more credible position than implying something that isn't quite true.
What's not worth chasing
It's worth being clear-eyed about a few things that sound appealing but don't add up to much in practice. Switching to a thinner mailing bag to reduce plastic volume isn't a sensible trade if it increases the failure rate and leads to more damaged parcels, since the environmental and financial cost of a failed delivery and reshipment outweighs the marginal plastic saving. Similarly, switching grip seal bags for a less functional paper alternative that doesn't reseal properly defeats the purpose of using that product category at all, since the whole point is repeatable, reliable containment.
The genuinely worthwhile changes are the ones that don't compromise function: kraft tape instead of standard tape, recycled rather than virgin polythene where the option exists, and correct sizing to avoid using more material than necessary. These changes are achievable without any meaningful downside, which is exactly why they're worth prioritising over more dramatic-sounding changes that compromise on reliability.
A practical starting point
If you're looking at where to start, switching your packaging tape to kraft paper tape is the single highest-impact, lowest-tradeoff change available within these three product categories. From there, checking that your mailing bags and grip seal bags are made from recycled rather than virgin material, and reviewing whether you're using the right sizes rather than defaulting to something larger than necessary, rounds out a genuinely credible reduced-plastic approach without compromising on the reliability your parcels need.
You can browse our full range across mailing bags, grip seal bags and packaging tape, including recycled and plastic-free options where available, to see what fits your business.
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