cheerios: 

12oz box: 6cm x 30cm x 19.5cm, $3.99

18oz box: 7cm x 32cm x 24cm, $5.19

tissues:

210 tissues: 12cm x 11cm x 22.5cm, $2.19

160 tissues: 12cm x 9cm x 22.5cm, $1.99

zip-top bags: 

50 bags: 6.5cm x 7.5cm x 18cm, $1.09

100 bags: 6.5cm x 7.5cm x 18cm (not a typo, like it's actually the same), $1.99