iPot double-layer bags are made of:. a heat-welded, fully waterproof PVC lining (black);. a 100% cotton cover, available in a range of colours.Each bag supports up to 5 kg weight.It's washable in cold water using a gentle cleansing.iPot bags can be used as a holder, a cachepot or a common flowerpot saucer, and you can even use them as pots by planting directly inside of them, provided you create a draining layer on the bottom and regularly monitor the compost humidity.Bags can be freely positioned by hooking their flaps to the iPot structure, thanks to an easy and handy strap system.