Worth buying in Japan? Will it work back home?

1 Tiger MMZ-W050★ 4.61 (Kakaku.com) JP¥2,200
2 Peacock AKT-50Affordable one-touch bottle with a safety lock from Peacock, a long-established Japanese vacuum flask maker. Lowest price on Kakaku.com is under 1,500 yen; keeps drinks at 68°C or above after 6 hours. JP¥1,476
3 Peacock AKZ-48Affordable Peacock screw-top bottle with a handle on the lid; keeps drinks at 73°C or above after 6 hours. Lowest price on Kakaku.com is about 1,600 yen. JP¥1,613

1 DHC DHC ビタミンC ハードカプセル 60日分 120粒★ 4.39 (Kakaku.com) JP¥388
2 Santen サンテFXネオ 12mLSanten's classic extra-cooling eye drops (Class 2 OTC drug). The Japanese package insert lists eye strain, conjunctival redness, itchy eyes, and more; the 12mL bottle fits in a carry-on liquids bag. JP¥272
3 Rohto ロートリセb 8mLRohto Lycée in a mini 8mL bottle with pink solution. Class 2 OTC drug; the Japanese package insert lists conjunctival redness, itchy eyes, eye strain, and more. JP¥449

1 Snow Peak GP-250GRIsobutane/propane mountain gas canister (220g net) for Snow Peak and other stoves. Official price 792 yen. Canisters are banned from both carry-on and checked baggage, so use it only in Japan. JP¥792
2 JETBOIL ジェットパワー230GMountain gas canister for JETBOIL stoves (230g net), sold at mont-bell stores for 880 yen. Canisters can't go in carry-on or checked baggage, so only buy one to use up while camping in Japan. JP¥880
3 Victorinox クラシックSD モンベルロゴA mini multi-tool weighing just 21g (blade about 37mm, scissors, nail file, etc.); mont-bell stores carry a version with its logo. However small, it's still a knife, so it must be checked. Official price 3,300 yen. JP¥3,300

1 ROYCE' 生チョコレート[オーレ] 20粒★ 5 (ROYCE' official online shop customer reviews) JP¥1,215
2 ROYCE' ポテトチップチョコレート[オリジナル] 190g★ 4.9 (ROYCE' official online shop customer reviews) JP¥1,188
3 Kitakaro 北海道開拓おかき枝幸帆立 170gKitakaro's signature savory rice cracker in scallop flavor, 170g per bag. The official site only gives a best-before of "about 5 weeks after delivery" with no total shelf life. Sold at the New Chitose Airport shop and Daimaru Sapporo. JP¥490

1 Ippodo Tea 初昔 20g箱Ippodo's entry-level usucha (thin tea): fresh with a slight astringency, and Ippodo itself recommends it for matcha lattes. 20g makes about 10 bowls of usucha at a friendly price. JP¥864
2 Itohkyuemon 宇治ほうじ茶宝かおり 60g袋Uji hojicha also served at Itohkyuemon's own tea house, with a pronounced roasted aroma and little bitterness. At 864 yen a bag, it's easy on the wallet for gifting or drinking yourself. JP¥864
3 Gion Tsujiri ほうじ茶古都かをり 80gThe hojicha used at Saryo Tsujiri, roasted with both leaves and stems; Gion Tsujiri calls it its most fragrant blend. Relatively low in caffeine and refreshing after a meal. JP¥1,296

1 Morinaga ハイチュウ＜ストロベリー＞ 12粒Hi-Chew strawberry stick pack: a chewy fruit candy for just over 100 yen a stick. Limited flavors often appear in Japan, so it's worth browsing. Contains gelatin. JP¥139
2 LOTTE コアラのマーチ＜チョコ＞ 48gSmall filled biscuits printed with various koala designs, just over 100 yen a box. The main appeals of buying it in Japan are the low price and the variety of flavors. JP¥150
3 Morinaga ミルクキャラメル 12粒The century-old milk caramel in the little yellow box: soft caramel made with condensed milk and butter. Just over 100 yen a box at convenience stores and supermarkets, with plenty of nostalgic charm. JP¥159