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@hollygramazio weather balloons? aliexpress.com/item/600g-meteorological-balloon-high-altitude-balloon-weather-balloon-sounding-balloon/1822494153.html?spm=2114.01010208.3.100.cXJsBf&ws_ab_test=searchweb0_0,searchweb201602_5_10065_10068_10501_10503_10000032_10000025_10000029_430_10000028_10060_10062_10056_10055_10054_509_10059_10099_10000022_10000012_10103_10102_10000015_10096_10000018_10000019_10052_10053_10107_10050_10106_10051_10000007_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10115_10000041_10000044_10078_10079_10000038_429_10073_10000035_10121-10503_10501,searchweb201603_2,afswitch_3,single_sort_2_default&btsid=0a8bba8f-1ac8-484a-b614-561980ca1a1a
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@hollygramazio i think water is the winner, but i am enjoying imagining a sports hall filled with 16ft weather balloons