If you have your own glider by all means install a relief tube system. If it is borrowed and doesn't have ziploc plastic bags work fine.
Borgelt Instruments - manufacturers of quality soaring instruments
Bags can leak!(pun) but work much better if you cut the pad out of a cheap disposeable nappy and put it in the bag. No smell, no drips, no worry if you don't get the ziplok completely closed, just a dry solid lump to put in the garbage when you land.
Graeme
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