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What's New, What's Hot is Travel Weekly's look at useful and fun travel gadgets, edited by Joe Rosen. First up, the Joshua Vest. Perfectly appropriate for hiking or cool-to-cold weather sightseeing, this garment packs away neatly in its own pocket, ready for use when you need it to keep you toasty warm. Its shell is made of polyester, while its lining is 100% nylon. At its heat-retentive core is 800-fill compressible dry down, which is water resistant and fast drying.

This unique cell phone-insulating case boasts an eight-layer cooling and heating system that protects any smartphone model in the hottest environments such as a tropical beach or a desert to the coldest of ski slopes. For those chilly climes, just microwave the empty ClimateCase 800 Series Phone Protector for 20 seconds, put your phone inside it and reattach a dedicated carabiner. To ready it for hot weather, put the case in a refrigerator for a few hours. It can also be used to restore an already disabled overheated or frozen cell phone.

No refrigeration or microwaving called for with the Lander Torrey Insulated iPhone Case, which more resembles a traditional case than does the ClimateCase 800, which is constructed more like a pouch. According to the manufacturer, the Lander Torrey is impact resistant from up to 10 feet and its insulation layer keeps an iPhone (7/8 to X models) operational in extreme temperatures. A detachable lanyard helps to prevent drops.

Use it as a rough and tumble travel bag or as that essential gym bag, the Wingman Sports Duffel from the Northwest Co. comes with the screen-printed, officially licensed logo of your favorite sports team. Virtually all major professional and collegiate teams are represented, so if your team is not on the list you are probably rooting for the wrong bunch. The bag is light for its size, is made from 600 D polyester and has a large main compartment, a side pocket, a zippered interior mesh pocket, carrying handles and a removable shoulder strap.

If you are heading for warmer climes this winter or already thinking ahead to summer at the shore, you might want to consider adding this neat product to your essentials. Made of a unique combination of bamboo derivative and spandex, the Bondi Ocean shoulder bag offers an eco-friendly, plastics-free way to carry your activewear and/or beachy things. Remarkably light weight, the Bondi bag will not shrink or stretch over time, according to Bondi, a company that offers a complete line of sports attire made of the bamboo-spandex mix.

Designed to be effective around the globe, the Grayl Geopress Water Filter requires no setup time and requires all of eight seconds to purify and filter 24 ounces of water, whether from a hotel sink in China or a jungle river. Not only does it save money on expensive, single-use bottles of water when you are on the go, it satisfies the ecological demand to rid the planet of plastic waste. Grayl maintains that the filter "provides complete protection from all waterborne pathogens, plus chemicals, heavy metals and even micro plastics.''