The company Sea to Summit is known for making all kinds of camping and outdoor adventure gear, from travel towels to sleep sacks to dry sacks to keep things from getting wet on a rafting trip.

This Ultra Sil shopping bag is meets a simpler need: carrying all the stuff you’re bringing back from the store. This tiny little pouch with a cinch strap is so small it can fit into a clenched fist, but then it unfolds like one of those GoLite travel jackets that are so handy. It only weighs 1.7 ounces—as in almost nothing.

This is no wimpy little sack though. It holds an amazing 285 pounds (130 kg) of stuff, with a capacity of 25 liters. Try that with a paper or plastic grocery bag!

I’ve given it a few trial runs walking to my neighborhood grocery store and plan to take this with me on a long trip this summer. It’ll be handy for shopping in the mercados of Mexico and then if I’ve got too many souvenirs at the end, this could pull double-duty as a carry-on bag.

The Ultra Sil Shopping Bag comes in four colors. Get more information about it at the Sea-to-Summit site. It is still a bit hard to find online, but is in stock at many independent retail gear stores and you can order it now at RockCreek.com.