- Wet bag
Having to carry back a mound of soiled diapers and sandy britches is not fun. Keeping a bag to put wet stuff into will save you some sanity.
There are plenty of fancy wet bags you can purchase, with cute prints on them, but in the end a handful of grocery bags will do the trick.
Try to keep one for strictly diapers, and one for clothing, so you are not going through the turmoil of separating the soggy diapers later.