For crates and totes that get wet, use synthetic label stock with an adhesive rated for damp or cold surfaces, and write on it with a permanent marker or paint pen, not a ballpoint or a standard felt tip. Where labels will not stick at all, use tags or write directly on the container with a paint marker. The test is simple: wet a sample, chill it and rub it, then see if it still reads.
This guide covers labeling equipment for lot tracking on crates, bins and totes in the packing area and cold storage. It does not tell you what records the law requires; that depends on your farm and your buyers, so ask your extension service or food regulator.
Why labels fail on wet crates
Three things beat a label: moisture on the surface when it is applied, condensation that forms when a warm crate goes into a cold room, and wash-down water that gets under an edge. Plain paper absorbs water and curls. Many adhesives need a dry, room-temperature surface to grab. Cheap inks smear or lift.
Solving the problem means checking three parts: the label material, the adhesive and the ink. A weak link in any one defeats the others.
Label materials and adhesives
| Option | Strengths | Watch for |
|---|---|---|
| Synthetic film labels (polypropylene or vinyl style) | Resist water and tearing | Check the listing for the surface and temperature they suit |
| Paper labels with a laminate | Cheap and printable | Edges can lift when wet, check the laminate covers the whole label |
| Removable freezer or cold-surface labels | Made for chilled and damp surfaces | Check adhesive wording and whether they peel off cleanly for reuse |
| Write-on tags with a string or ties | Do not depend on adhesive | Strings can snag, tags can wick water if not sealed |
| Tape that takes marker (masking or vinyl) | Quick, flexible | Plain masking tape loses grip when wet, so check the type |
Read the adhesive statement on the listing. Makers often say whether a label is for freezer, refrigerator, damp or outdoor use. If the listing says nothing, assume it was designed for dry room-temperature surfaces and test it before you buy a roll.
- Surface: smooth plastic crates take labels more easily than textured or dusty ones. Wipe and dry the spot before sticking.
- Size: big enough to hold your lot code in a size you can read at arm's length.
- Removable or permanent: if you reuse crates, a label that peels cleanly saves scrubbing. If crates are single-use, permanent is fine.
- Roll or sheet: rolls suit a dispenser or printer, and sheets suit hand writing.
Look for synthetic stock, a freezer or damp-surface adhesive statement and a size that fits your lot code. Buy a small roll to test on your own crates first.
Markers and pens
Ink choice matters as much as the label. A marker that works on dry paper may fail on wet plastic. Choose by surface and by how you handle the crate afterward.
- Permanent markers: work on most synthetic labels and some plastic. Check the listing for water resistance and the surfaces it works on.
- Paint pens and paint markers: write on damp or oily surfaces and hold up to wash-downs. They are slower to dry, so check the dry time.
- Grease pencils and wax markers: write on wet or cold surfaces and wipe off when you want to reuse the container. Smudge easily when dragged.
- Chalk markers: suit a slate or board for temporary notes but wipe off, so they are not for lot records.
- Pencils: work on some tags and paper labels, and fade less than ink on wet paper.
Test any marker on a sample label: write, let it dry, wet it, then rub with a thumb. If it smears, find another. For markers that wipe off, remember that water and handling will wipe them too. Keep a spare pen in every packing area so the one that dies does not stop the line.
Printers and pre-printed labels
Writing every label by hand takes time and invites errors. If you pack many lots a week, a small label printer or pre-printed sheets may pay off. Check that the printer works with the synthetic stock you want, and check whether printed text is smudge and water resistant. This depends on the print method and the ink or ribbon, so read the listing and the label stock notes.
- Keep a small stock of blank labels for unexpected cases.
- Print the lot code in large type, then the date and crop in smaller type.
- Tape or heat-seal a clear cover over printed paper labels if the label stock is not water resistant.
Check the label sizes a printer accepts, whether supplies are widely available and whether the ink is listed as water resistant. Used printers can be a fair buy if the supplier still stocks the rolls.
A simple lot-marking routine
The best label is the one that is filled in the same way every time. A short routine beats a clever system.
- Decide the fields: crop, harvest date, block or field and packer initials.
- Write them in the same order and in the same spot on each crate.
- Label two sides, so a stack of crates can be read from either direction.
- Add a color code (tape or marker color) for the day or the destination if you move product quickly.
- Keep a log sheet that matches the labels. A label with no record behind it is only a guess.
Check with your extension service or food regulator on any record-keeping that applies to you. This guide gives the equipment, not the rules.
Wash-downs and cold rooms
Tags, tape and writing on the crate
When labels will not stick, skip adhesive. A write-on plastic tag on a loop or tie, a strip of vinyl tape that takes marker, or a paint marker applied straight to the crate all work. Direct marking suits crates that stay in one job, such as a dedicated cold-room bin. Tags suit mixed crates because you can move them from one container to another. Check that a tag material resists water and that the hole or loop does not tear.
Removing old labels
Reused crates collect old labels, and a crate with three layers of paper and glue is hard to clean. Peel labels when the crate is warm and wet, scrape residue with a plastic scraper rather than a metal one that can scratch the surface, and follow the crate maker's care notes for any solvent. Scratches hold dirt, so a gentle approach protects the container and keeps it easy to wash. Removable-adhesive labels make this job much shorter.
Wash-downs, stacking and condensation
Crates that cycle between a wash line, a cooler and a truck face a lot of stress. Plan for it. Apply labels after crates are washed and dry, not before. Put the label on a flat part of the crate, away from edges and handles that scrape. If you stack crates in a cold room, check that labels are on a face that is visible after stacking. The stackable tote guide and the vented crate guide describe the containers these labels go on, and the harvest tote guide covers field bins.
Condensation appears when cold product meets warm humid air, and it ruins labels fast. A data logger helps you see how humid the room is; the temperature and humidity data logger guide covers the options. If you store roots or squash for months, labels need to last; the root cellar supplies guide covers the containers.
Frequently asked questions
What kind of label sticks to a wet crate?
Labels made for damp or freezer surfaces have adhesives meant for that job. Read the listing, apply to a dry clean spot when you can and test a sample before you buy a roll.
What marker works on wet plastic?
Paint pens and wax or grease markers write on damp surfaces, and permanent markers work on many synthetic labels. Test any marker by writing, wetting and rubbing.
How do I keep labels from peeling in a cold room?
Use cold-surface adhesive, apply to a clean dry surface before the crate goes cold and avoid edges and handles where labels catch. Tags are an option where labels fail.
Should I print labels or write them by hand?
Hand writing is fine for a few lots a week. A small printer helps when you pack many lots, if its labels and ink are water resistant.
What should go on a lot label?
Commonly the crop, date, block or field and packer, but the required fields depend on your buyers and local rules. Ask your extension service or food regulator.
Sources and verification
This guide is buying advice about labeling equipment, based on common packing-room practice rather than a single source. It gives no adhesive temperature ratings, ink ratings or shelf-life claims, because those come from each maker. It does not state what records the law requires; ask your extension service or food regulator.