Rennen X-Pac Crossbody Sling 2.5L, Black

Boundary Supply Rennen X-Pac Crossbody Sling 2.5L — Ultralight EDC Sling That Laughs at Rain

The gist: A 2.5L crossbody sling built from VX21 X-Pac — the same waterproof, tear-resistant laminate used in sailing and technical outdoor gear — weighing just 0.26 kg and carrying a day’s essentials hands-free.

• Waterproof X-Pac shell: VX21 X-Pac with YKK AquaGuard® zippers keeps phone, passport, and wallet completely dry; no rain cover needed.
• Dedicated back phone pocket: AquaGuard-sealed back panel pocket puts your phone within reach without opening the main compartment — useful at transit gates and markets.
• Featherlight carry: At 0.26 kg (0.575 lb) and 10" × 5.5", it’s invisible on the body and won’t slow you down on long walking days between neighborhoods.
• Modular exterior lash loops: Outer webbing loops let you attach extra pouches or water bottles when the 2.5L main compartment isn’t enough.

Tech Jio’s hands-on review calls the Rennen Sling “well-built” with organized compartments that are “great to use for travelling to keep additional gear that your pockets don’t have space for.”

Best for: Travelers who want a compact, waterproof crossbody for passport, phone, wallet, and a battery pack during city days — without carrying a full daypack. Skip it if: You need to carry more than the basics — 2.5L is a secondary bag, not a daypack. Runs ~$69 — check the current price before buying.