What it is: A heavy plastic bag that protects a wine bottle or other fragile vessel in transit.
How it works: Insert the bottle, inflate the bag partially by blowing into the stem, roll up the bottom to form a spillproof barrier in case a bottle does break, fasten the strap to protect the seal and inflate the bag the rest of the way.
The good: I put a bottle of cheap white wine (thin glass) in to the VinniBag, then went out to my concrete driveway, held it a foot off the pavement and dropped it. No problem. Four feet cracked the bottle. The next issue was whether the seal would hold. So I shook the bag, let it sit for about 10 minutes, then shook it again. No leak. I deflated it and the bottle fell to pieces. Next question: Did the glass puncture the bag? I filled it with water, sealed it, inflated it. No leak.
The bad: Having to pack one more thing. Wines the world over can be found in large cities, but occasionally you do find a specific little souvenir that you may not find at home. The VinniBag would be worth the haul.
Cost: $28 (cheaper in multiples). Available from: vinnibag.com or various wine and travel stores.