We have been saving our toilet paper rolls. Why? Because I wanted to trial seed planting inside the rolls.
My first attempt proved faster to complete a seed planting session, than newspaper pots.
One challenge however was to not spill soil everywhere with my hand spade. This was my solution.
Even though I placed all the rolls on a seed planting tray, they were still susceptible to falling over and loosing the soil from the bottom. Keep seedings out of the wind and away from curious toddlers (not mentioning any names).
When ready to plant the seedlings into the garden, I could use a kitchen spatula to pick them up carefully and then plant the seedling and roll straight into the garden.