Our range of cremation urns should remain airtight and waterproof once the gasket at the base is tightened to its final state. Should you wish to keep the ashes of a loved one close perhaps interred in the earth in the garden you should order the Standard Classic Custom Cremation Casket. This sized urn has an additional reinforced inner chamber to ensure the safety of the contents, which is very important if you intend to place it in the ground. Here is a short video of the best way to place the casket of ashes in the ground.