Gear Inventory

As of 2018, age 57. Assume 4 months each year in United States until age 65, thereafter permanent move to Europe and no further bicycle touring, but hiking continues. Probably not much hiking after age 85, but planning for age 95 allows for defective items in inventory. Thus lifetime supply would be 8 years bicycle touring gear and 38 years hiking gear.

Assume commercial bicycle gear continues widely available until age 65, so no need to stock up on those items (other than Rohloff oil, which might be subject to shipping restrictions in the future, but I currently have a lifetime supply of that in storage). Hand-sewn bicycle gear made of commonly available fabrics (1000d coated nylon cordura, 1" nylon webbing, etc), so no need to stock up on those items either.

Possible for some items below to become obsolete with time. Rear tarp pole can probably be improved upon, but I only have a small inventory of those and cost of that inventory was negligible. Paper currency and coins will be replaced by electronic payment eventually, but coin purse will continue to be useful for holding keys made of metal or hard plastic, to prevent loss and abrasion to pants pocket fabric, and I don't expect such keys to become entirely obsolete in my lifetime, at least not in the low-cost hotels I tend to patronize.

Most items that I sew myself use pure nylon or pure polyester fabric, for which there have been only incremental and increasingly slow improvements over past 60 years, which suggests physical limits are being approached. Only obvious area for improvement is more consistent thickness of high-loft continuous fiber polyester insulation, but that is a manufacturing and quality control issue, rather than an innovation in underlying fabric, plus improvement would be small since thickness is only somewhat inconsistent currently.

Leather in boots capable of being improved upon by synthetic fabrics. However, past experience shows that footwear designers often lack common sense to use synthetic fabrics properly. Gore-tex lined summer boots a fine example of misuse of synthetic fabric. Well-designed and properly fitting boots partly made of inferior material like leather much better in practice than boots made of best imaginable materials but with stupid design and/or poor fit. Also, I don't hike much in wet conditions and replace boots annually, so defects of leather (absorbs water, cracks eventually) don't affect me much. Which is why I have no qualms about spending $5000 stocking up on boots.

No point stocking up on electronics and other items where there is constant innovation, nor items that will always be widely available, like common toiletries.

Carrying System

Backpack
Current very worn. Storage: 1 heavily used of slightly different design; 2 completed cordura shoulder straps; 8 foam pads for shoulder straps; 2+ yards 430d coated packcloth in charcoal; 2 yards 430d coated packcloth in black. Design not perfected, so don't sew up many spares yet. Plenty of fabric in stock. Cut/sew spare.
Neckpurse
Current new as of Nov 2018. Storage: 1 new, 1 heavily used of older design; plenty of fabric. Sew up more spares in Nov 2019, after year of testing new design.
Drysacks
Pair in packing list. Current pair in good condition. Storage: 4 new. Fabric no longer sold, but substitute fabrics widely available. Adequate spares for now.
Silnylon stuff sacks and food sacks
Storage: fabric cut for 4 large and 1 medium; at least 6 new medium; 3 new small; 2 used medium; 1 used small; 1 used food. Adequate spares for now.
Heavyweight cordura cases for sharp tools
Current in good condition. Storage: 5 new. Probable lifetime supply.
Heavyweight cordura case for mirror
Current in good condition. Storage: 5 new. Probable lifetime supply.
Lightweight cordura case for p-51 can opener
Current in good condition. Storage: 5 new. Probable lifetime supply.

Shelter, sleep system

Tarp
Current new as of Oct 2017. Storage: 1 new current design with guylines, 4 new current design without guylines; 1 heavily used current design with polecups and guylines; 1 moderately used 2008 design (rear roof panels 4" wider per side, hence wider footprint), with polecups and guylines; 2 front pole cups; 1 rear pole cup. Probable lifetime supply.
Stakes and stake sacks
Current (8 nail stakes, 6 sand stakes, sacks) in good condition as of Nov 2018. Storage: 17 nail stakes; 16 sand stakes; 3 new nail stake sacks; 1 new sand stake sack; plenty of red 3mm pull cord. Probable lifetime supply.
Rear pole
Current new as of Oct 2017. Storage: 3 new. Tubing used for current rear pole no longer sold, but substitutes available. Adequate spares for now.
Bugbivy
Current new as of Oct 2017. Storage: 9 new. Probable lifetime supply.
Sleep pad
Current new as of Oct 2017. Storage: uncut foam for 12. Probable lifetime supply.
Winter quilt (used for bicycle touring)
Current new as of Oct 2017. Storage: 1 used of older and narrower design. Can use 3-season quilt as substitute. Probable lifetime supply.
3-Season quilt
Current new as of Jan 2017. Storage: 4 new. Probable lifetime supply.

Hiking Clothes

Headnet
Current good condition. Storage: 5 new. Probable lifetime supply.
Blaze-orange hat cover
Current in good condition. Storage: 1 new, yard of fabric. Cut and sew 2 more spares.
Insulated hat
Current in good condition. Storage: 1 new. Order shell fabric and insulation for 4 spares and cut/sew 3 more spares (extra insulation for sewing mistakes). Design not perfected yet, but next iteration of sewing should bring design to perfection.
Sleep hat
Current new as of Oct 2017. Storage: 11 new. Probable lifetime supply.
Poncho
Current (HyperD PU4000 fabric) new as of Nov 2018. Storage: 1 new of HyperD PU4000, 1 new of silnylon, silnylon fabric cut for 2 silver-grey and 2 dark-grey. In Nov 2019, assuming all goes well with HyperD PU4000 fabric, order more of that fabric and sew up more spares.
Jacket
Current new as of Jan 2017. Storage: 24 yards supplex, 8 zippers. Order lining/insulation. Cut/sew 8 spares.
Shirt
Current new as of Jan 2017. New spare in packing list. Storage: 35 new, 24 zippers, 20 yards supplex. Probable lifetime supply.
Pants
Current new as of June 2018, but patched to fix tear in leg. Spare in packing list was new as of Jan 2017, but bad fit and patched to fix tear in leg. Storage: fabric cut for 11 spares; 24 yards uncut taslan (enough for 12+ pants). Sew more spares.
Mittens
Current pair good condition as of Nov 2018. Storage: 12 new pairs. Probable lifetime supply

Clothes from commercial vendors

Can go out of production or design might change. Even if commercially available in future, need spares in storage for out-of-stock situations.

Wide-brim hat
Sunday Afternoon Charter hat, size L, new as of Nov 2018. Storage: 3 new. Buy 4 more spares.
Nylon crew socks
4 pairs/year. Current in okay condition as of Nov 2018, 3 new pairs in packing list. Storage: 139 new pairs. Probable lifetime supply.
Boots
Replace annually in Jan (or every 2000km hiking). Storage: 36 new pairs 10W, 1 new pair 10XW, 3+ used pairs 10W. Most critical item of all, since I absolutely don't want substitutes and can't make my own boots. Probable lifetime supply.
Coin purse
Current in good condition. Storage: 8 new, 1 used. No longer sold, but probably could find substitute. Probable lifetime supply.
Hanging wallet
2 in packing list, both in good condition. Exact model no longer sold, but similar substitutes available. Storage: 4 new. Adequate spares for now.
Dress clothes
Current mocassins new as of Jan 2017. Storage: 1 new pair mocassins, 20+ new pairs nylon over-the-calf socks. Necklace and dress shirt can be easily replaced with substitutes. Probable lifetime supply.

Consumable gear from commercial vendors

Can go out of production or design might change. Even if commercially available in future, need spares in storage for out-of-stock situations.

Stick
Replace every few years. REI PowerLock stick (used for hiking) new as of Jan 2018. Mountainsmith stick (used for bicycle touring) in good condition as of Jan 2018. Wooden knob for mountainsmith stick new as of Jan 2018. Storage: 4 new REI PowerLock sticks, 6 new Mountainsmith sticks, 2 new wooden knobs. Adequate spares for now.
Aloksaks and Opsaks
Replace yearly, or perhaps more often for Opsaks. Storage: 6 - 12.5x20" opsaks, 6 - 12x12" aloksaks, 6 - 6x9" aloksaks, 5 - 4x6" aloksaks. Adequate spares for now.
Nalgene bottles and jars
Replace occasionally. Current bottles/jars in good condition. Storage: 2 x 1.5L bottle, TBC - 600ml bicycle bottles, TBC - 125ml bottles, TBC - 60ml bottles, TBC - 30ml bottles, TBC - 30ml jars in storage.
Sink stopper
Rubber hardens over time, due to oxidation. Can never find flat stoppers in Europe. Current in good condition, 5 spares in storage. Adequate spares for now.
Field repair tube seamgrip
For repairing dromedary water bladders, drysacks, etc. Seldom used. Current tube unused, 10 tubes in storage. Probable lifetime supply.
Field repair tube silnet
For repairing tarp and poncho. Seldom used. No longer sold. Current tube unused, 1 tube in storage. NEED SUBSTITUTE!
Small roll duct tape
Seldom used. Current partly used as of Nov 2018. Storage: 3 new rolls. Adequate spares for now.
Mirazyme
30ml in packing list. Storage: 1 unopened 8oz bottle, 1 slightly used 2oz bottle. Adequate supply for now.

Durable gear from commercial vendors

Steripen prefilter
Current in good condition. Storage: 2 new body elements, 12 new cartridges. Compact design no longer sold. Probable lifetime supply.
Acrylic mirrors
Current in good condition. Storage: 6 new. Probable lifetime supply.
P-51 can openers
Current good condition. Storage: 4 new. Probable lifetime supply.
Scissors
Current needs sharpening. Storage: 3 new. No longer sold, but substitutes available. Probable lifetime supply.
Knife
Current needs sharpening. Easy to replace. Probable lifetime supply.
Spoon
Current in good condition. Storage: 1 used. Substitutes available. Probable lifetime supply.
Cup
Current in good condition. Storage: 1 used. Substitutes available. Probable lifetime supply.

Fabrics/notions

Does not include fabrics/notions listed above as gear inventory in process of being cut/sewn.