How to choose and Urn.
First you need to consider the final resting place. Burial, Scattering, place in a niche or placed at home.
You will need to contact the cemetery to find out what they will allow for burial. Most cemeteries require a permanent container, something not fragile to be placed in the ground. Some cemeteries require an urn vault for the urn to be placed in for the burial. Also size of the urn for the space allowed. The marble urns are the most popular for burials.
Scattering cremated remains at sea, or at a cemetery or other places, please check with the rules and regulation, what you want may not be allowed. Always good to ask for permission first. Cemeteries have fees for scattering remains over other graves, even if you own them. Local or private land you may want to check for permission and or special permits may be needed. Scattering at sea you can check with the EPA for proper permits and or regulations, you must be at least 3 nautical miles from land. For urn choices you may want to look at scattering urns or scattering tubes, water burial urns, bio degradable urns or less expensive urns as the urn itself is only temporary.
The dimensions of the urn are important if the urn will be placed in a columbarium niche. The style of the urn can become more important if you will have the urn 'on display’ at home. You may want to consider something more personal and or have engraving or special attributes on the urn.