The part of a litter tray that decides how you feel about it is the corner. Waste dries into a right angle and stays there, no scoop ever made has an edge that gets properly into one, and that is why trays are replaced long before anything on them has actually broken.

Moderna have built this one with round edges only - the tray, the corners, the join - so there is nothing square for anything to pack into, and they say the whole box cleans with warm soapy water. It is a hooded loo at 54CM with an extra deep tray, and the top and bottom simply click together, so it arrives as one thing rather than as a base and a hood bought separately. The door is semi-translucent rather than solid. A charcoal filter sits in the hood to help with odour, and there is a carrying handle moulded in so the whole box can be picked up and moved. The plastic is BPA-free, non-toxic and made from +98% recycled material.

• 54CM hooded litter box
• Round edges throughout, nothing square to scrape out
• Extra deep tray
• Semi-translucent door for privacy
• Charcoal filter included
• BPA-free, non-toxic, +98% recycled material

On the door, and on the one measurement. A semi-translucent flap is not a solid one, but it is still a flap, and plenty of cats will not push through anything at all to get to a tray - if yours is nervous or new to the house, take the door out for the first few weeks and put it back later. The only measurement supplied for this box is 54CM, with no width, height or depth given against it, and Moderna list the range as coming in several sizes, so there is not enough here to plan a specific corner of a bathroom around. No replacement interval for the charcoal filter has been published to us either.

Who it's for: owners who do the cleaning and have run out of patience with square trays, particularly in a flat where the loo has to live somewhere it can be seen and occasionally carried.