Custom Pet Bag Size Ladders for Retail

Pet carrier production desk · Updated 2026-10-07 · 14 min read

Custom pet carrier programmes run at MOQ 500 pieces per colourway, with samples in 6-10 working days and bulk production in 35-50 days under AQL 2.5 inspection.

Read a size ladder as a price ladder, because that is what a buyer reads

When a buyer looks at a four-rung pet bag range, the first thing they read is not dimensions. It is the price structure, because the price structure tells them what the range is for: whether it is an entry range designed to win a price-conscious shopper, a mid-market range designed to hold a shelf, or a premium range designed to make the retailer's adjacent own-brand look reasonable. The dimensions are checked afterwards, and only to confirm that the price structure is honest.

This matters because it changes what the ladder has to do. A range whose prices step evenly and predictably reads as a considered programme. A range with an irregular price structure - a small at 29, a medium at 34, a large at 59 - reads as four products that happened to be developed separately, and a buyer will treat it as four separate listings rather than as a block. Buyers allocate space to blocks.

The second thing a buyer reads is the rung count, and the answer they want depends on the shelf. Four rungs is the default because it is the smallest number that produces a full price story: an entry price, two volume prices and a trade-up price. Three rungs works for a price-led range and for a retailer with tight space. Five rungs usually signals that a brand has mistaken coverage for choice, and it produces the outcome buyers complain about most - two adjacent rungs that steal from each other while a third sits unsold.

The third thing a buyer reads is the mix recommendation. A supplier who says here are four sizes, sell what you like is asking the buyer to do the merchandising work. A supplier who says four rungs, recommended opening mix 20/35/30/15, reorder pattern driven by the middle two is handing over a plan, and plans get approved faster than options.

None of this is in conflict with good product design. It is simply the argument for deciding the commercial structure before finalising the dimensional one, because the dimensional structure has enough freedom to serve almost any sensible commercial plan, and the reverse is not true.

Setting the price steps between rungs

The distance between adjacent prices is the single most consequential merchandising decision in a ladder, and it is almost always set by cost-plus rather than by shopper behaviour. Cost-plus produces steps that track material usage, which means small steps at the bottom of the ladder and large steps at the top, because a large bag uses disproportionally more fabric, hardware and freight. Shopper behaviour wants the opposite pattern.

A step that is too small - under about 12 percent - produces cannibalisation. A shopper standing between a 39 and a 43 product will choose on colour rather than on size, which means the retailer is carrying two SKUs to serve one decision, and the smaller one will eventually be delisted. A step that is too large - over about 35 percent - produces a gap. A shopper who needs something between the two rungs does not trade up, they leave, and the gap is where a competitor's product gets listed.

The working range is 18-25 percent between adjacent rungs, and the discipline is to hold it roughly constant up the ladder rather than letting it grow with cost. That usually means accepting a lower percentage margin on the top rung and a higher one on the bottom, which is the correct trade: the top rung is where the brand's photography and reputation are made, and the bottom rung is where the volume and the price perception are made.

The facing allocation in that table is the part that surprises people. The top rung gets the fewest facings and carries the most brand value, because its job is to make the range look serious rather than to sell in volume. The second rung gets the most facings because it is the rung most shoppers will land on, and a shopper who cannot find their size in the rung they expected does not search, they walk.

Margin architecture should then be checked rung by rung rather than on average. A range that averages an acceptable margin can still contain a rung that is unprofitable after freight, and in pet bags that rung is almost always the largest one, because freight cost per unit rises with cube far faster than retail price does. The largest rung should be modelled on landed cost, not on ex-factory cost, before its price is fixed.

Facings, shelf depth and the planogram conversation

A planogram is a negotiation about space, and a pet bag range competes for space against products that are smaller, denser and faster-selling. The range that wins that negotiation is the one that arrives with a space plan rather than a product.

Three numbers drive the conversation. Footprint: how much shelf width the range needs at the recommended mix. Depth: whether the product fits the retailer's standard shelf depth, which in most pet categories is shallower than the product's natural depth, and which therefore determines whether the product stands, hangs or leans. And height: whether the largest rung clears the shelf above, which is a constraint that regularly kills an otherwise good range at the line review.

Height is the one most often missed. A four-rung ladder designed without reference to shelf spacing will have a top rung that is 40 mm too tall for the bay, and the buyer's response is not to re-space the shelf, it is to drop the rung. Designing the top rung to a maximum external height set by the target retailer's standard bay is a cheap constraint to adopt early and an expensive one to discover late.

Stacking and hanging are the two presentation modes, and the choice is usually made for the brand by the retailer. Pet speciality chains frequently hang soft carriers, which means the range needs a hang solution - a header card, a hanger loop or a shelf-ready tray - and the hanging presentation changes which face of the product carries the branding. Grocery and general merchandise frequently shelve, which means the product needs a flat, stable base and legible side faces, because a shelved product is often viewed from the side rather than from the front.

The supplier-side lever that wins space is shelf-ready packaging. A case that converts into a tray, with the range pre-arranged in the recommended mix, removes the retailer's labour cost of setting the shelf and measurably increases the chance the full ladder gets listed rather than two rungs. It adds packaging cost and it is almost always worth it for a range competing for a first listing.

One further number should be prepared before the meeting: sales density per linear metre. Buyers are measured on it, and a range that states an expected annualised density for its block is answering the question the buyer is accountable for. The estimate need not be precise - a band built from the mix recommendation, an assumed weekly rate per facing and the retail price is enough - and ranges that offer it are often given more space, simply because the buyer can justify the allocation upward.

It is also worth stating what happens if the range underperforms. A defined review point at two quarters, with an agreed action if density falls below a threshold, turns a listing decision into a reversible experiment, and buyers take reversible experiments far more readily than commitments.

Naming and signage: an eight-second decision

A shopper standing in front of a pet bag shelf makes a size decision in roughly the time it takes to read two lines of text. Naming is therefore a navigation design problem, and the failure mode is a naming system that requires the shopper to already know the range.

Size names that work are self-describing. A weight band - Small 5-10 kg - is self-describing because the shopper knows their animal's weight. A dimension is semi-describing because the shopper has to go home and measure. A breed example is pseudo-describing because the shopper's animal is not the example. And an abstract tier name - Classic, Deluxe, Elite - is not describing anything, and it forces the shopper to read the fine print on every rung before they can form a preference.

The strongest structure is a weight band as the headline and the product's role as a secondary line: Small 5-10 kg, everyday carry. That second line is doing more work than it appears to, because it tells the shopper what the rung is for and it gives the range a reason to have four options rather than one.

Shelf signage then has to repeat the same vocabulary in the same words. A bay where the product says 5-10 kg and the shelf edge label says Small is a bay where the shopper has to reconcile two systems, and a meaningful share of shoppers will not bother. Aligning product labelling, shelf labelling and the online size guide on one vocabulary is unglamorous work with a direct conversion payoff.

There is one naming trap specific to ladders: naming by letter. S, M, L, XL is compact and it is fine as a secondary reference, but as a primary system it fails the shopper who cannot remember whether their last purchase was a medium or a large. If letters are used, the weight band should be printed with them.

The ecommerce ladder: filters, comparison and the returns link

Online, a size ladder is not a shelf, it is a filter, and the ladder's structure determines whether the filter helps or hurts. A four-rung ladder produces a filter with four options, which is the right number: enough to be useful, few enough to be readable. A six-rung ladder produces a filter with six options and a measurable drop in filter usage, because shoppers abandon filters that ask them to know too much.

The comparison module is the highest-value asset a ladder can produce, because it directly attacks the category's dominant return reason - the customer bought the wrong size. A simple comparison table with rung name, weight band, internal floor dimensions and a photograph of all four rungs at a consistent scale converts a guessing game into a selection. Producing it requires the ladder to have been photographed that way in the first place, which is a development-stage decision, not a marketing-stage one.

Product page structure should then reinforce the ladder rather than isolate it. Each rung's page should show the other three rungs as alternatives with their weight bands visible, because the most common reason a shopper lands on the wrong rung is that they arrived from a search result rather than from the category page and never saw the range.

Review aggregation is a subtle but real ladder effect. Reviews should be aggregated at product-family level for rating purposes and kept separate at rung level for fit feedback, because a four-rung product with eight reviews per rung looks unproven while the same product with a family rating looks established. Structuring this correctly is a marketplace configuration decision that should be made before launch.

Finally, the returns data should come back to the development team. A ladder with a return rate concentrated on one rung has a dimensional problem on that rung, not a returns problem, and the fix is usually a 30-40 mm change to a floor dimension rather than a change to the size guide copy.

Case packs, DC handling and the replenishment maths

Between the production line and the shelf sits a distribution centre, and a ladder that ignores it generates costs nobody budgeted. Three decisions govern this stage: how many units per case, whether cases are single-rung or mixed, and how replenishment is triggered.

Single-rung cases are the default and they are usually right for the two volume rungs. They make DC picking predictable, they make cycle counts easy, and they let a retailer replenish the rung that actually sold without taking stock of the rung that did not. Their weakness is that a store opening order has to buy a full case of the slowest rung, which is where the top rung often stalls.

Mixed cases solve the opening-order problem and create a picking problem. A mixed case containing all four rungs in the recommended mix lets a new store open the full ladder with one case, which is genuinely attractive to a buyer opening twenty stores, but it means the DC cannot replenish a single rung without breaking a case. The usual resolution is mixed cases for initial openings and single-rung cases for replenishment, which is a packaging programme rather than a compromise.

Case quantity per rung should follow the rung's size, not a single convention. A case of six large carriers and a case of six small carriers are very different objects: the large case may exceed a manual handling limit and the small case may be inefficiently small. Setting case quantities per rung - more units per case at the bottom of the ladder, fewer at the top - keeps every case inside the same weight and cube envelope, which is what a DC actually wants.

Replenishment then has to be planned against the mix, not against the total. If the opening mix is 20/35/30/15 and the ladder is reordered on total units, the fast rungs will stock out before the slow rungs have sold through, and the retailer will delist the range for poor availability. Publishing a reorder template alongside the opening mix is a small piece of account management that prevents the most common cause of a second season not happening.

Labelling and barcoding close the loop. Each rung needs its own barcode, each case needs a scannable label, and the label should state the rung in the same vocabulary used on the shelf and online. Quality and process discipline on this kind of detail is part of what ISO 9001 certified systems are meant to deliver; see ISO 9001 quality management for the framework our partner base is audited against.

Running the ladder across seasons without restarting it

A ladder is a multi-season asset, and the programmes that extract the most from it treat the dimensions as fixed and the expression as variable. The structural work - patterns, grading rules, baseboards, test protocols, case packs - is done once. What changes seasonally is colour, fabrication detail, branding execution and the accessories bundled with each rung.

The seasonal lever that works best is colour concentration. Rather than offering every colourway on every rung, a seasonal accent is concentrated on the two volume rungs, which keeps each colourway above its minimum while keeping total inventory flat, a technique set out in colour range planning for a pet bag line. The arithmetic of what a colourway minimum actually costs once it is divided across rungs sits in the MOQ planning guide, and it should be read before the season is committed rather than after. The trade-up rung carries the core colourway only, which also has the effect of making the seasonal colours feel scarcer than they are.

The second lever is bundling. A travel bowl, a washable liner or a matching accessory attached to the second and third rungs creates a gift-tier price point without a new pattern, and it gives the retailer a reason to give the range an end-of-aisle position in a gifting season. Bundling is the cheapest available way to add a price rung above the ladder without adding a fifth shell.

What should not change seasonally, unless there is compelling data, is the dimensional structure. Every time a rung is re-dimensioned, the size guide asset, the comparison module, the case pack and the planogram all have to be redone, and the cost of that rework falls on the brand rather than on the production side. The discipline of leaving dimensions alone and changing everything else is what makes a ladder compound in value over three or four seasons.

The third lever is the entry rung, and it deserves attention because it is the one most often mishandled. An entry rung that is too cheap undermines the whole staircase, setting the shopper's reference price at the bottom of the ladder so every step up reads as a surcharge. Priced too close to the second rung it simply does not sell. The workable position is clearly the cheapest option, complete rather than stripped, and far enough below the second rung that the step reads as a decision.

When a change is genuinely needed - a market shift, a persistent return pattern on one rung - treat it as a new rung rather than as a revision. Develop the new rung, run it alongside the old one for one season, and let the sell-through data decide. That approach costs one extra pattern and avoids the much larger cost of changing a live range under a retailer.

What to bring to the line review

The practical output of all this planning is a set of artefacts, and having them ready is what separates a supplier that gets a listing from one that gets a maybe.

Bring the full ladder, not a hero sample. A buyer needs to see the block to believe it is a block, and the comparison between rungs is the product's strongest argument. Bring the prototype set as samples in 6-10 working days ahead of the meeting if the timeline allows, because a buyer who has handled the range before the meeting spends the meeting on terms rather than on product.

Bring the mix recommendation, the price staircase with the steps stated as percentages, and the facing plan. These three together answer the buyer's real question - what does this do for my shelf - and they are rarely offered, which is why offering them is cheap differentiation.

Bring the compliance and test position. Dimensional and load evidence per rung, referenced to recognised test methods such as those published by ASTM International, plus the labelling and safety documentation the retailer's own compliance team will request. Retail compliance teams ask for this after the meeting, and the delay while it is assembled is a common cause of a listing slipping a season.

Finally, bring the calendar honestly: bulk production 35-50 days from approval and deposit, one production window so all rungs share a dye lot, inspection to AQL 2.5 with per-rung records, T/T 30/70 and FOB Xiamen. A buyer can plan around a calendar they believe, and cannot plan around one that turns out to have been optimistic.