8 x 4 x 21" 1 Mil Gusseted Poly Bags - Expandable Sides, Case of 1000
$85.61
/ case of 1000$0.09 per bag
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Ships from the nearest of 5 US warehouses · freight calculated at checkout
30-day returns on stock items · Return policy
Inside dimensions
8" × 4" × 21"
Board / material
1 Mil
Color
Clear
Freight class
Class 60
Specifications
| Inside dimensions | 8" × 4" × 21" (L × W × H) |
|---|---|
| Board / material | 1 Mil |
| Color | Clear |
| Sold as | Case of 1000 |
| Order in multiples of | 1000 |
| Case weight | 17.18 lb |
| Outer carton (shipping) | 12.0 × 9.0 × 8.75 in |
| LTL freight class | Class 60 |
| GTIN | 841436038485 |
| SKU | PB1381 |
About this item
SKU PB1381 — 8" × 4" × 21", 1 Mil, Clear. Sold as a case of 1000, shipped from US warehouses.
The 8 x 4 x 21" 1 Mil Gusseted Poly Bags - Expandable Sides is a gusseted poly bag for bulkier parts, grouped items, apparel, liners, and inner packs. Listed specs include size 8" x 4" x 21"; poly material; 1 Mil; case of 1000. Use it as a packing bag, parts bag, inner poly envelope, or e-commerce bag when the item fits the listed size and thickness.
Gusseted poly bags: Good fit for bulky, irregular, or deep items that need expandable side or bottom space. These poly bags help fulfillment, warehouse, ecommerce, and parts teams choose right-sized bags for storage, kitting, packing, and shipping workflows.
Common questions
How should I judge fit for the 8x4x21" size?
The listed size is 8x4x21" — the gusseted sides fold out so the bag can open to its listed depth and sit around blockier items. The catalog lists inside-usable dimensions of 21" H x 8" W x 4" Gusseted Depth, so that measurement is what your item has to fit within.
What does 1 mil film mean in practice?
A mil is one-thousandth of an inch, so 1 mil film is 1/1000" thick — 4 mil film, for example, is twice the film thickness of 2 mil. Heavier film of the same material stands up to punctures and rough handling better; lighter film costs less per bag and packs tighter. This listing's material is specified as 1 Mil LDPE Polyethylene.
Can I swap PB1381 for the next size up or down?
Not as an exact replacement. The closest sizes in this line are 5x4x24" and 10x4x20" (same 1 mil film), and the same 8x4x21" size is also stocked in 1.5 mil. Before switching, match the listed dimensions, 1 mil thickness, and case count — then reorder by exact SKU PB1381.
What do I need to seal these, and what does a full order look like?
These are open-top bags — close them with a heat sealer, bag tape, twist ties, or staples, whichever fits your workflow. This listing is sold as one case of 1,000 bags — roughly $0.086 per bag at the current case price (confirm the live price before ordering). Orders ship from Packrift's five US warehouse regions (Central IL, NE PA, S TX, SE GA, and W CA); delivery options and timing are shown at checkout.
Order support
Questions on specs or freight?
Send the SKU, quantity, and delivery ZIP and we will confirm specs, availability, and freight before you order.