The top 3 Superow Backpack for Onewheel GT S-Series, GT, & XR™ (PREORDER: Shipping by October 31st) | Onewheel Bag | Onewheel Backpack alternatives are
OSBS Tote,
TFL Rider Bag / Backpack, and
OSBS Cross Body Bag.
If these 3 options don't work for you, we've listed more alternatives below.