Who this checklist is for
I run purchasing for a 40-person agricultural supply company. Packaging is the single biggest line item I own — about $260,000 a year across six vendors — and I answer to the warehouse manager on one side and our finance lead on the other. So every bag order has to pass two tests: it has to hold the product, and the paperwork has to clear accounting without anybody calling me.
This is the eight-step checklist I run before any woven bag purchase order goes out. It covers PP woven sacks for fertilizer, laminated rice bags, onion mesh bags, cattle and poultry feed bags, D-cut shopping bags and the plain sacks you would use for cement or sand. Roughly three hours of actual work, spread across two or three weeks of calendar time. If your packing season starts in a month, read step seven first and see whether you still have room.
The eight steps
Step 1: Write the spec down before you email anybody
Most bad bag orders start with a vague email. You ask for a quote on 50 kg fertilizer bags and get six prices that are really six different products. Then you pick the cheapest one and spend the next quarter explaining why it tears.
Put this on one page:
- Fill weight and product type (granular fertilizer, milled rice, whole onions, pelleted feed)
- Flat dimensions in mm or inches — width by length, plus the bottom gusset if there is one
- Fabric weight in GSM and yarn type
- Liner: none, or an LDPE tube or PE liner bags, with the gauge in microns
- Closure: sewn top, heat seal, or valve
- Print: unprinted, flexo up to four colors, or BOPP laminated
- Handles: none, D-cut, or drawstring
- UV stabilization if the bags will sit outdoors
- Packing: bales of 500 or 1,000, or cartons, and how many per pallet
Checkpoint: it fits on a single page, it is a PDF, and it is the same document for every supplier. When we standardized ours in 2023, the quote-to-sample cycle went from about five days to two. Not because anyone got faster — because nobody had to ask what we meant.
Step 2: Pick the bag type before you compare prices
Price comparison only works inside one category.
- Plain woven PP — fertilizer, grain, sand, cement-type fills. Cheapest per unit, no print appeal.
- Laminated woven sacks (BOPP) — rice, flour, anything retail-facing. You are paying for the print and the shelf look, often 40-60% more per bag.
- Mesh and leno agricultural mesh bags — onions, garlic, potatoes, produce that has to breathe. Red onion bags are their own product; a laminated bag will rot your crop.
- D-cut woven bags — retail shopping and promotional use.
I have watched people price a mesh onion bag against a laminated rice bag and conclude the market is rigged. It is not. Different products.
Step 3: Send every supplier the same quote template
Ours has eleven columns: unit price at 10k, 50k and 100k pieces, MOQ, cylinder or plate fee, setup cost, sample cost, lead time in days after artwork approval, FOB or CIF port, payment terms, packing format, and quote validity.
Two things stay buried if you do not ask. The cylinder fee on printed bags — one-time, per color, sometimes $80-150 a color — and whether the printing is actually done in their plant. Ask directly. A surprising number of woven sack manufacturers sub-contract the printing. That is not automatically bad, but it changes your lead time and it changes who fixes the color when it comes out wrong.
Step 4: Get a filled, packed sample — the step almost everyone skips
Swatches lie. A 12 by 12 cm square of fabric tells you nothing about how a 50 kg bag behaves when it hits the corner of a pallet.
Send them your product, or the exact fill weight, and ask for 20-30 bags filled on their line, sewn, stacked and dropped once from about 1.2 m onto concrete. Ask for photos of the results. This costs money and takes a week. It is still the cheapest line item in the whole order.
Looking back, I should have paid for that sample run on our first rice bag order. At the time the swatch looked fine and the price was good, so I skipped it. Four thousand bags split at the bottom seam during our first fill. Not the supplier's fault in the end — we had spec'd a 90 g bag for a 50 kg fill, and our own line over-filled to 52 kg.
Step 5: Lock the artwork and ask who owns the printing cylinder
Approve a physical or digital proof, not a verbal yes. Pin down the Pantone references, the color count, and how many revisions are included. Then get two things in writing on the PI: who owns the cylinder, and what a reprint costs after twelve months. If you switch suppliers, a cylinder you paid for should either go with you or be quoted back to you at a stated price.
Step 6: Confirm the paperwork before money moves
Proforma invoice with the HS code, packing list, certificate of origin if your customs broker needs it, payment terms (30/70 TT is what we work on). And on certification: ask for the certificate number and the scope, not the word certified. We keep a scanned copy on file now. Early on I ate a rejected expense because the invoice did not match the PI — the $2,400 came out of my department budget, and I have verified paperwork capability before ordering ever since.
Step 7: Build the timeline backwards from your packing date
Production runs 15-30 days after artwork approval for most woven sack manufacturers. Ocean freight to a US port is another 25-40 days, plus customs. Chinese New Year shuts plants for two to four weeks, and the two weeks before the holiday are useless for new orders. Work backwards from the day your line needs to run, then add three weeks you think you do not need.
Step 8: Inspect on arrival and keep the approved sample
Weigh ten bags on a kitchen scale against the spec in grams per bag. Count bales, not estimates. Drop-test three. Check the liner gauge and that the liner is attached at the top seam where it should be. Compare the print against the signed sample under daylight. Photograph everything before the container is emptied.
There is something satisfying about opening a container and finding the count exact to the bale and the weight within 2 g of spec. After two years of almost-but-not-quite, that is the payoff.
Common mistakes I have made or watched
- Comparing per-bag price without comparing grams. A 75 g bag and a 95 g bag are not the same product at two prices.
- Assuming lamination adds strength. It adds print quality and moisture resistance, not tensile strength.
- Searching pp woven bags near me and stopping there. Local distributors are fine for 500 bags next week; at 50,000 pieces a year they typically run 20-40% above factory-direct.
- Forgetting that the cylinder fee resets every time you change artwork, so a cheap reprint quote is only cheap for repeat artwork.
- Storing bags in a damp warehouse for six months and then blaming the supplier. Polypropylene does not absorb water, but the print and the liner do not love humidity either.
- Trusting poultry feed bag price quotes that arrived without a spec sheet attached. Those numbers are not comparable to anything.
One note on the numbers
The quotes we collected in January 2025 for a plain 50 kg woven fertilizer bag, 95 g, unprinted, FOB Qingdao, ran roughly $0.12-0.18 at 50,000 pieces. Laminated rice bags with six to eight colors came back at $0.20-0.30 depending on GSM and liner. Verify current rates — that is a year-old snapshot from one buyer's inbox, not a market index.
Bottom line: the checklist is boring and it works. Write the spec, compare inside one category, pay for a filled sample, and keep a signed sample on the shelf. The suppliers worth keeping are the ones who answer all eight steps without getting defensive.