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A banker bag is a simple object that is surprisingly easy to order badly. The canvas looks right in a photo, the logo looks sharp on a screen proof, and then the finished bags arrive too flimsy for coin, too small for strapped currency, or printed with type the weave has swallowed. Most of these misfires trace back to a handful of decisions made without the underlying specs. Here are the mistakes that cost a reorder, and the concrete numbers that prevent them, whether you are buying working cash bags for a branch or branded canvas bags as client gifts.

Choosing canvas by look instead of weight

Cotton duck is graded on the numbered, or Army, duck system, and it runs backward from what most people assume: the lower the number, the heavier the cloth. A #12 duck is about 11.5 ounces per square yard, #10 is roughly 14.75 ounces, #8 is about 18 ounces, and it climbs to #4 at 24 ounces and #1 near 30. Ordering by a vague description like heavy canvas invites a mill to ship whatever they have. Specify the number or the ounce weight and you control the result.

For most branded banker bags, the practical band is #10 to #8, roughly 14 to 18 ounces, which holds a crisp printed shape without feeling like a tarp. Step heavier only when the load demands it. Coin is dense and abrasive, so a coin bag is often better in #6 or #4 canvas around 21 to 24 ounces, where the seams and floor can take the weight. Lighter #12 is fine for a slim document or gift sleeve but will feel cheap as a working cash bag. Match the weight to the job before you fall in love with a color.

Sizing the bag to itself instead of to the contents

The second common error is picking a size off a chart without measuring what actually goes inside. A US note is 6.14 inches long and 2.61 inches tall, so a currency bag needs an interior clear length of at least six and a quarter inches to let strapped bundles lie flat rather than curl. Rolled coin is only about three inches per roll but stacks heavy. Business checks and letter documents folded in thirds run near eight and a half inches, and a ten-inch tablet in a client onboarding kit needs about nine and a half.

Always add roughly an inch of ease beyond the bare footprint for seams, the closure, and the simple reality that a bag stuffed to its exact interior dimension is hard to open and close. If the same bag has to serve double duty, as a deposit bag on weekdays and a leave-behind gift with a notebook inside, size to the larger content and let the smaller one rattle. Undersizing is the more expensive mistake, because a bag that forces its contents to fold looks and feels wrong no matter how good the canvas is.

Treating the closure as an afterthought

The zipper or drawstring is where a cash bag earns its keep, and it is routinely the last thing anyone specs. Zippers are graded by gauge, and the number roughly reflects the tooth width in millimeters: a #5 coil is light-duty, while a #8 or #10 metal zipper stands up to daily open-and-close and the weight of coin. For anything handling money, ask for a metal zipper in the #8 to #10 range with a pull that can take a numbered tag or a plastic security seal, so the bag supports a basic tamper-evident control. Drawstring closures suit coin and bulk but offer less security unless paired with a seal. Deciding this up front also affects the pattern, because a heavy zipper needs a reinforced top hem to carry it.

Designing artwork the canvas cannot hold

Cotton duck has a visible tooth, and that texture eats fine detail. Small serif type under about eight points, thin hairlines, and subtle gradients tend to break up or fill in when screen printed onto coarse duck. On a #8 or heavier canvas especially, keep the artwork bold and high-contrast, set a minimum line weight, and convert delicate logos to a solid, simplified mark. Where the brand needs to look premium, embroidery and a debossed or stitched leather patch read far better on canvas than a struggling fine-line print, and they hide the weave rather than fighting it. Ask for a physical strike-off on the actual fabric, not just a flat digital proof, before you approve a detailed design.

Ordering waxed canvas and expecting a crisp print

Waxed canvas is popular for its water resistance and its deepening patina, but the wax is a decorating problem. A waxed surface repels water-based inks and can resist adhesion, and heat from curing or pressing softens the wax and moves it around. The clean sequence is to print or embroider first and wax afterward, or to leave a wax-free panel for the logo. If a supplier promises a sharp screen print directly onto an already-waxed bag, treat it as a claim to verify with a sample. Untreated duck simply takes decoration more reliably, so if crisp branding matters more than weatherproofing, start there.

Ignoring minimums and lead time until the deadline

Finally, custom canvas has real production floors that surprise first-time buyers. Custom-decorated bags on stock blanks commonly carry minimums around 50 to 100 pieces, and fully custom construction from scratch runs higher. Lead times swing widely: decorating stock blanks domestically can turn in roughly two to four weeks, while cut-and-sew production overseas often needs eight to twelve weeks or more once sampling and shipping are counted. Treat those as indicative rather than fixed, because they move with season, factory load, and freight. The mistake is not the timeline itself but discovering it a week before a branch rollout or a closing event. Lock the specs, approve a physical sample, and back-plan from the date you actually need bags in hand, and nearly every problem on this list disappears before it can cost you a reorder.

Choosing a deposit bag looks simple until you are staring at a supplier catalog with a dozen sizes, two very different security philosophies, and a price range that runs from pennies to more than thirty dollars a bag. The right choice depends on how your cash moves: whether a bag makes a one-way trip to a night drop, or rides back and forth between a register and a safe for months. This walkthrough covers the decisions in the order you actually make them, so a custom order lands with the size, closure, and numbering your cash-handling process needs.

Start with the fork: single-use tamper-evident or reusable locking

The first decision drives everything else. Single-use tamper-evident bags are co-extruded polyethylene pouches with a permanent adhesive seal. Once closed they cannot be reopened without leaving visible damage, which makes them ideal for daily cash drops, shift-end tills, and anything headed to a night deposit or an armored pickup where the bag is opened only at the destination. Reusable locking bags are canvas or reinforced vinyl with a zipper and a keyed lock, built to make the same trip hundreds of times, typically in a swap-and-relock system where the bank or head cashier holds the key.

Cost follows directly from that choice. A single-use tamper-evident bag can run well under fifteen cents at volume, but you buy a new one for every deposit. A reusable locking canvas bag is often in the fifteen-to-thirty-dollar range for a single unit and less in quantity, but it amortizes over every trip it survives. The chart below shows the crossover using indicative figures: past roughly a couple hundred deposits, the reusable bag is cheaper per drop. That math only applies when the same bag genuinely gets reused, so treat it as a guide to amortization rather than a reason to switch control models.

Match the size to the deposit, not the other way around

Undersizing is the most common ordering mistake. Bag sizes cluster around a familiar ladder: small pouches at 4 by 6 and 5 by 9.5 inches, mid-size bags at 9 by 12 and 10 by 14 inches, and large sacks at 15 by 20 inches and up. Coin is the variable that catches people out, because rolled coin is dense and bulky in a way that banded currency is not. A till drop that is mostly notes fits comfortably in a 9 by 12 bag, while a coin-heavy retail or laundromat deposit often needs the next size up or a gusseted sack. The figure below plots the usable footprint of each common size so you can see how quickly capacity grows as you move up the ladder.

Order a size that leaves the bag two-thirds full rather than straining at the seal, because an overstuffed tamper-evident closure is harder to seal cleanly and a jammed zipper shortens the life of a locking bag.

The tamper-evident features that actually matter

Not every feature printed on a spec sheet changes your risk. The ones that do are the closure and the audit trail. A permanent cross-cut or adhesive closure is the core of a single-use bag; it should tear or void visibly if someone tries to lift and reseal it. Sequential serial numbering with a matching tear-off receipt is what lets you reconcile a specific bag to a specific deposit, and it is the feature most worth insisting on for any process that touches an auditor. Look also for a high-visibility barcode, commonly around three-quarters of an inch tall, if bags are scanned into a tracking system, and thermochromic or solvent-reactive ink that discolors when someone tries to open the adhesive with heat or chemicals.

Materials sit underneath those features. Most retail single-use bags are heavy-gauge co-extruded polyethylene; premium versions add reinforced vinyl, Tyvek, or laminated constructions for tougher transit. On the reusable side, canvas is the workhorse, with a keyed lock and usually two keys per bag, each bag keyed uniquely so a lost key does not compromise the fleet. A framed card window, often around 3.5 by 4.5 inches, lets you slot a route or department label without printing a fresh bag each time.

Numbering and branding a custom run

Customization is where a stock bag becomes your bag. On single-use tamper-evident stock, the practical custom elements are a printed logo or store name, a deposit form layout (date, prepared-by, verified-by, amount fields), and the serial and barcode sequence itself. Deciding the numbering scheme up front matters more than the artwork: choose whether numbers run continuously across an annual order or reset by location, because that decision shapes how easily you reconcile later. Reusable locking bags are customizable on request as well, most often with a printed or embroidered department name, a color assigned per route or per store, and the ID card window filled to match.

Quantities behave differently for each type. Single-use bags are sold in cartons, frequently in packs of 250, and per-unit price drops as you move into the thousands, so it is worth estimating a full year of daily drops before ordering. Reusable bags are bought closer to the count of active routes plus spares, since you are outfitting a rotation rather than consuming stock. Whichever you choose, order a modest overage: tamper-evident bags occasionally void during handling, and locking bags need replacements as zippers and locks wear.

A quick way to decide

If cash makes a one-way trip and an unbroken seal is the proof you care about, specify single-use tamper-evident bags, size them to your fullest routine deposit, and put your effort into the serial-and-receipt numbering. If the same bag will shuttle between a register and a safe under a controlled key, choose a reusable locking canvas bag, key it uniquely, and brand it by route or department. Most cash operations of any size end up using both, matching the bag to the trip rather than forcing every deposit through one format.

When a banker bag holds up for a decade of daily cash runs, the reason is almost always the cloth. Canvas is easy to take for granted, yet the difference between a bag that frays at the seams in a year and one that softens into a keepsake comes down to a couple of numbers on the spec sheet. Cotton duck, the material most banker bags are cut from, is described by two overlapping systems that confuse first-time buyers: a numbered scale and an ounce weight. Understanding both lets you order the right bag instead of guessing.

What cotton duck canvas actually is

Duck is a plain-woven cotton fabric, tightly constructed so the weave sits flat and dense rather than showing the open grid of a cheap tote. The name has nothing to do with the bird; it comes from the Dutch word doek, meaning cloth. What sets true numbered duck apart is its construction, typically a double-fill or plied-yarn weave that runs two yarns together in the weft. That extra yarn is why duck feels tighter and stronger than a single-ply canvas of the same nominal weight, and it is the reason the fabric has been trusted for tents, mailbags, and workwear for more than a century. For a bag that gets stuffed, dropped, and gripped every day, that density is doing real work: it resists abrasion at the corners and keeps the weave from distorting under load.

The numbered duck scale, decoded

The numbered system is the part that trips people up, because it runs backward. A lower number means a heavier, stronger cloth. On the standard scale, number 12 duck is the lightest at about 11.5 ounces per square yard, and number 1 is the heaviest at roughly 30 ounces. In between, number 10 lands near 15 ounces, number 8 near 18, number 6 near 21, and number 4 near 24. So a supplier who lists a bag as #10 duck is telling you it is a 15-ounce cloth, squarely in the range that suits a hard-working bag. Individual mills vary by around half an ounce, which is why a good spec sheet quotes the ounce weight alongside the duck number rather than relying on the number alone.

Ounce weight is the more universal language, and it is worth learning to read it directly. Roughly speaking, canvas around 7 ounces is lightweight material for pouches, linings, and light apparel. The 10 to 12 ounce band is the everyday middle ground, strong enough for totes and standard bags while staying easy to sew and fold. From 12 to 14 ounces you get the extra body suited to duffels and heavy-duty bags, and 15 to 18 ounces is genuinely heavy cloth built for high-abrasion, high-load use. Above roughly 18 ounces you are into industrial territory, the weight of truck covers and floor cloths, which is more than most bags need and harder to work into clean seams.

Matching weight to the job

For banker and deposit bags specifically, the useful window sits between about 10 and 18 ounces, and where you land depends on what goes inside. A slim bag meant to carry checks, deposit slips, or documents does its job well in a 10 to 12 ounce cloth that stays light and flexible. A standard deposit bag that sees daily handling is well matched to roughly a 12 to 15 ounce duck, heavy enough to hold its shape and survive being tossed into a drawer or a night drop, light enough to feel manageable. When the bag is built for coin and bulk cash, the added abrasion and weight argue for an 18 ounce cloth, and only genuine cash-in-transit or tool-bag duty justifies pushing toward the 24 ounce extra-heavy grades. The bands below are indicative rather than a fixed standard, but they capture the trade-off: every step up in weight buys abrasion resistance at the cost of flexibility, sewability, and price.

Waxed and treated canvas

Untreated cotton duck is breathable and takes print well, but it is not water resistant, and a soaked canvas bag dries slowly. Waxed canvas answers that by impregnating the cloth with a paraffin or blended wax, which sheds light rain and gives the fabric a characteristic patina that deepens with use. The trade-offs are real and worth stating plainly. Waxed cloth is stiffer, especially when new, adds a little weight, cannot go in a washing machine, and needs periodic re-waxing to keep its water resistance. For an indoor or counter-handled banker bag, untreated duck is usually the better and cheaper choice; for a bag that travels outdoors between locations, a waxed or otherwise treated finish earns its keep. If water resistance matters but you want to avoid wax maintenance, ask suppliers about durable water-repellent treatments, which sit lighter on the hand though they wear off faster than wax.

How weight affects branding and cost

Heavier cloth is not automatically better for decoration. A tightly woven mid-weight duck around 12 to 15 ounces gives screen printing and embroidery a stable, flat surface without the bulk that makes very heavy canvas awkward to hoop or press. Extremely heavy grades can resist crisp fine-line printing and add cost in both material and shipping weight, so specifying the heaviest cloth available is rarely the smart default. The right move is to choose the lightest weight that comfortably survives the intended load, then let the print method follow from there.

Specifying canvas with confidence

When you request a quote, name three things: the ounce weight or duck number you want, whether the cloth is untreated or waxed, and the load the bag will carry day to day. Those details tell a supplier far more than the word canvas on its own, and they let you compare quotes on equal footing instead of discovering after delivery that one vendor’s bag is a flimsy 8 ounce cloth and another’s is a stiff 18 ounce industrial grade. Where possible, ask for a fabric swatch or a sample bag and handle it before committing to a run. A minute spent feeling the weave and checking the seams will tell you more about how the bag will age than any product photo, and it turns a vague material into a decision you can stand behind.