Getting Started With Your Nesco Vacuum Sealer
A Nesco vacuum sealer removes air from a bag and seals it shut to keep food fresh longer. The machine works by drawing air out of a specially designed bag, then heating the top edge to fuse the plastic closed. Most Nesco models use the same basic steps: place a bag in the sealing strip, press down, and let the machine do the work. The whole process takes about 5 to 10 seconds per bag.
Before you seal anything, unpack your Nesco sealer and read the manual that came with it — different models have slightly different controls. Plug the machine into an outlet and let it sit for a few minutes. Some Nesco sealers have a small light that turns on when the machine is ready; others are ready to use when ready after plugging in.
Key Takeaways
- Fill bags no higher than the sealing strip, or air will escape and the seal will fail.
- Use only bags designed for vacuum sealing — regular freezer bags will collapse and tear.
- Let the machine cool for 30 seconds between seals if you are sealing more than three bags in a row.
- Test your first seal by trying to pull the bag apart; if it opens easily, the seal did not hold and you should try again.
- Wipe the sealing strip with a damp cloth every few uses to remove food residue that can prevent a tight seal.
Preparing Your Bags and Food
The bag you use matters as much as the machine. Vacuum-seal bags have a special plastic construction that can withstand the heat and pressure of sealing. Regular freezer bags, sandwich bags, and storage bags will not work — the plastic is too thin and will tear or collapse when air is removed. Nesco sells bags in different sizes; choose the size that fits your food with about an inch of space at the top.
Fill your bag with food, leaving at least 1.5 inches of empty space at the top. This space is where the seal will form. If you fill the bag too high, food particles or moisture can get into the sealing strip, and the seal will fail. For wet foods like marinated chicken or fish, place the food in the bag first, then seal it partially, let it sit for a minute so the liquid settles, and then complete the seal. This prevents liquid from being sucked into the machine.
Pat dry any wet surfaces on the food before sealing. Excess moisture can travel up into the sealing strip and damage the heating element over time. If you are sealing something very wet, like fresh berries or cooked pasta, consider freezing it first so the moisture is locked in place.
The Sealing Process: Step by Step
Place the open end of your filled bag into the sealing strip — the slot that runs across the top of the machine. The bag should sit flat and centered in the strip, with the opening facing up. Do not fold or bunch the bag; let it lie naturally. Close the lid or press the sealing button, depending on your model. Most Nesco sealers have a hinged lid that you lower and hold down, while some have a button you press once.
Hold the lid down or keep pressure on the button for the entire sealing cycle. The machine will beep or the light will turn off when the seal is complete — this usually takes 5 to 10 seconds. Release the lid and carefully remove the bag. The seal will be hot, so do not touch it when ready. Let the bag cool for 10 to 15 seconds before handling it.
Check your seal by trying to gently pull the bag open at the sealed edge. A good seal will not budge; the plastic should feel fused together. If the bag opens easily, the seal did not hold. This usually means the bag was overfilled, the sealing strip was dirty, or the machine needed more time to heat up. Empty the bag, wipe the sealing strip, and try again.
Maintenance and Troubleshooting
The sealing strip is the most important part of your Nesco sealer, and keeping it clean will prevent most problems. After every few uses, unplug the machine and wipe the sealing strip with a damp cloth or paper towel. Food particles, crumbs, and dried liquids can build up and prevent the plastic from fusing properly. Let the strip dry completely before using the machine again.
If your seals are failing even after cleaning, the machine may need time to cool down. Nesco sealers can overheat if you seal more than three or four bags in quick succession. Unplug the machine and let it rest for 30 to 60 seconds, then try again. If the machine still will not seal properly after cooling, check that you are using the correct bags and that the bag is positioned correctly in the sealing strip.
Never submerge your Nesco sealer in water. The heating element and electrical components are not waterproof. If liquid gets inside the machine, unplug it when ready and let it dry for at least 24 hours before using it again. If the machine does not work after drying, it may need professional repair.
Sealing Different Types of Food
Dry foods like crackers, nuts, and cereal seal easily and quickly. Place them in the bag, leave the required space at the top, and seal normally. These foods will stay fresh for months when sealed properly.
Soft foods like bread, cookies, or fresh fruit can be crushed by the vacuum process. For these items, use the pulse seal feature if your Nesco model has one — this removes less air and applies gentler pressure. If your model does not have a pulse feature, seal the bag without running the full vacuum cycle. Some Nesco sealers have a "seal only" button that skips the vacuum step and just fuses the bag shut.
Marinated meats and fish need special care because of the liquid. Freeze the food first, or use the partial-seal method described earlier. Soups and sauces can be sealed in bags and frozen flat, then stacked to save freezer space. Cooked foods should cool to room temperature before sealing.
Storage Tips After Sealing
Sealed bags can be stored in the refrigerator, freezer, or pantry depending on the food. Most sealed foods last much longer than unsealed ones — typically two to three times as long. Label your bags with the contents and the date you sealed them, using a permanent marker on the plastic.
Store sealed bags flat in the freezer if you have space; this makes them easier to stack and thaw. Once a bag is thawed, do not reseal it. If you need to store leftovers again, transfer them to a new bag and seal it.
Frequently Asked Questions
Can I reuse vacuum-seal bags?
No. Once a bag has been sealed and used, the plastic is damaged and will not seal again. Reusing bags wastes time and often results in failed seals. Nesco bags are inexpensive and designed to be single-use. Buying bags in bulk reduces the cost per bag.
What should I do if food leaks out of the bag while it is sealed?
This usually means the seal did not hold completely. Check that you left enough space at the top of the bag and that the sealing strip was clean. If liquid is leaking from a sealed bag in the freezer, the bag may have been punctured or the seal failed over time. Transfer the food to a new bag and reseal it.
Can I seal bags with liquids inside?
Yes, but freeze the liquid first or use the partial-seal method. If you try to vacuum-seal a bag full of liquid, the liquid will be sucked into the machine and damage it. Freezing the food solid before sealing prevents this problem.
How long does a Nesco vacuum sealer last?
Most Nesco sealers last three to five years with regular use and basic maintenance. Keeping the sealing strip clean and not overheating the machine will extend its life. If the heating element fails, the machine cannot be repaired and will need to be replaced.
Why is my seal coming open after a few days?
The seal may have been incomplete from the start, or the bag may have been punctured after sealing. Check that you are using the correct bags and that the sealing strip is clean. If seals consistently fail after a few days, the machine may need to cool down between uses.