Mylar Bag Sizes: How to Choose the Right Size for Your Product
Width, height and gusset explained, typical fill amounts and a simple way to check a size before you order.
Choosing the wrong pouch size is one of the most common packaging mistakes. Too small and the product will not fit or the zipper will not close; too big and the bag looks half empty on the shelf. Here is how mylar bag sizes work and how to pick the right one.
How mylar bag sizes are measured
Pouch sizes are written as width × height × gusset, usually in inches. Width is measured across the bag, height from the bottom to the top edge, and gusset is the depth of the folded bottom when it is fully open. A 5 × 8 × 3 inch stand-up pouch is 5 inches wide, 8 inches tall and opens to 3 inches deep at the base. Flat pouches have no gusset, so they are written as width × height only.
Why weight is only a guide
Suppliers often label sizes by weight, such as “4 oz” or “1 lb,” but that only tells you how much of a typical product fits. Density changes everything: 4 oz of hard candy takes up far less space than 4 oz of popcorn or loose-leaf tea. Use weight labels as a starting point, then check the dimensions against your product.
Typical stand-up pouch sizes
- 4 × 6 × 2.5 in: about 1–2 oz of snacks or coffee, or a single serving
- 5 × 8 × 3 in: about 3–4 oz, a popular retail size
- 6 × 9 × 3.5 in: about 6–8 oz
- 7 × 10 × 4 in: about 12–16 oz
For coffee, flat bottom bags are labeled by whole bean weight, from 8 oz up to 2 lb. For flower, sizes are commonly labeled 3.5 g, 7 g, 14 g and 28 g. Every product page in our shop includes a size and fill guide, for example on stand-up mylar bags and cannabis mylar bags.
Leave room for the zipper and seal
The top of a pouch is taken up by the tear notch, the zipper and the heat seal, roughly 1.5 to 2 inches in total. Measure your product’s height and add that space, otherwise the product sits in the zipper and the bag will not close cleanly.
How to test a size before you order
- Weigh one pack of your product.
- Pour it into a measuring jug to find the volume.
- Compare it with a bag you already have, or ask for a sample.
- Fill the sample, close the zipper and see how it stands.
If you are still unsure, send your product details on the quote form and choose “Not sure — suggest a size.” We will recommend a size based on what you are packing.
Frequently asked questions
What size mylar bag do I need for 1 lb of coffee?
A flat bottom bag of about 6 × 10 × 3.5 inches is a common choice for 1 lb of whole beans. Ground coffee is denser and fits slightly smaller bags.
Can I order a custom size?
Yes. Standard sizes can be ordered online, and any width, height and gusset can be quoted.
Does the gusset count toward the height?
The gusset folds up into the bottom of the bag, so a deeper gusset slightly reduces the usable printed front panel.
