Truck Bed Cargo Bag Buying Guide: What Actually Matters

A cargo bag looks simple — it's a big waterproof sack that straps into your truck bed — but the details decide whether your gear stays dry on a 6-hour highway run in the rain or gets soaked through the first time it's tested.

Material Matters More Than Size

Look for 840D PVC or heavier. Thinner fabric fails at the seams under wind pressure at highway speed, which is exactly when you need it to hold. Our Truck Bed Cargo Bag is 840D PVC with 26 cu ft of capacity (51.18" x 40.16" x 21.85") — enough for a full camping load or a Costco run that doesn't fit in the cab.

What to Check Before You Buy

• Attachment points: bungee cords and carabiners built in, not sold separately.
• Zipper covers: a flap over the zipper keeps rain from wicking through, even on a "waterproof" bag.
• Fit: confirm it fits your specific bed length — open-bed bags that are too big shift around and catch wind.

Securing It

The bag keeps water out; it doesn't keep itself in the bed. Strap it down the same way you'd secure any cargo — our ratchet straps work well for this since you can dial in even tension across a bag that's stuffed unevenly.

Check out the Cargo Duo bundle for the cargo bag paired with our bed mat at a discount.