First of its kind. Found only at Ely Bike & Kicksled, the Kicksled Sack. 
 
Zach from Romp Bags made these Kicksleds Sacks (or Satchels) to hang on the handlebars while riding your kicksled. The sack has a large main pouch for mitts, a puffy, and/or 32ox insulated sippy receptacle. A fleece lined 'map' sleeve for phones and other devices is snuggled up against the main pouch for easy access. In town, pull out the attached strap and convert to an over the shoulder bag.
 
Seamed together with tough 500 denier cordura for a future of use and abuse. 
 
*May customize if the request aligns with available/accessible materials.