A reusable water bottle and a folding tote bag are among the lowest-cost highest-benefit travel additions. Save money on bottled water and disposable bags. Reduce plastic waste. Handle daily travel logistics (water access, carrying purchases, beach trips).
What to pack
Collapsible silicone water bottle (Stojo or Hydaway, packs flat empty). Folding nylon tote (Baggu or similar, weighs 30g, fits in pocket).
Where they earn their place
Airports increasingly have free water refill stations. Most accommodation has tap water (check safety; Europe and most developed Asian destinations fine). Daily walks where you'd otherwise buy disposable bottles. Beach trips, market shopping, day excursions.
Combined weight: under 100g. Combined cost: under £25. Combined savings on bottled water and bag fees over a year of travel: £100-200. One of the most cost-effective travel upgrades.