Vaude Ayla Backpack Kids Rock Melone 29 x 21 x 12 cm / 5-9 L (Sports)
A little large for a 3 year old (1m just before his 3 years) but will be well in a year or two at the end of kindergarten. Everything depends also what there is left in it: for a drip, a blanket, a packet of tissues and a change of clothes, he will r